diff --git a/.github/workflows/benchmark.yaml b/.github/workflows/benchmark.yaml
index 07f4320f99..22225fbf0f 100644
--- a/.github/workflows/benchmark.yaml
+++ b/.github/workflows/benchmark.yaml
@@ -11,7 +11,7 @@ on:
         default: '["clean", "node_modules", "cache", "cache+node_modules", "cache+lockfile", "cache+lockfile+node_modules", "ci", "lockfile", "lockfile+node_modules", "registry-clean", "registry-lockfile"]'
       binaries:
         description: "The binaries to run the benchmarks on"
-        default: '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,bun,deno,aube,upm,nx,turbo,vp,node"'
+        default: '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,vlt-npm,bun,deno,aube,upm,nx,turbo,vp,node"'
       warmup:
         description: "The number of warmup runs on each benchmark"
         default: "2"
@@ -94,7 +94,7 @@ jobs:
           if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
             [[ "$IN_FIXTURES" == '["next", "astro", "vue", "svelte", "large", "babylon"]' ]] || partial=true
             [[ "$IN_VARIATIONS" == '["clean", "node_modules", "cache", "cache+node_modules", "cache+lockfile", "cache+lockfile+node_modules", "ci", "lockfile", "lockfile+node_modules", "registry-clean", "registry-lockfile"]' ]] || partial=true
-            [[ "$IN_BINARIES" == '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,bun,deno,aube,upm,nx,turbo,vp,node"' ]] || partial=true
+            [[ "$IN_BINARIES" == '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,vlt-npm,bun,deno,aube,upm,nx,turbo,vp,node"' ]] || partial=true
             [[ "$IN_WARMUP" == "2" ]] || partial=true
             [[ "$IN_RUNS" == "5" ]] || partial=true
           fi
@@ -128,7 +128,7 @@ jobs:
     env:
       # rc.21 is advertised by the canary channel but its Linux ARM64 npm binary is missing.
       BENCH_ZPM_VERSION: "6.0.0-rc.20"
-      BENCH_INCLUDE: ${{ fromJson(inputs.binaries || '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,bun,deno,aube,upm,nx,turbo,vp,node"') }}
+      BENCH_INCLUDE: ${{ fromJson(inputs.binaries || '"npm,yarn,berry,zpm,pnpm,pacquet,vlt,vlt-npm,bun,deno,aube,upm,nx,turbo,vp,node"') }}
       BENCH_WARMUP: ${{ (github.event_name == 'push' && github.ref != 'refs/heads/main') && '1' || (inputs.warmup || '2') }}
       BENCH_RUNS: ${{ (github.event_name == 'push' && github.ref != 'refs/heads/main') && '1' || (inputs.runs || '5') }}
     steps:
diff --git a/app/src/hooks/use-history-data.ts b/app/src/hooks/use-history-data.ts
index b546583e9c..bba5acef03 100644
--- a/app/src/hooks/use-history-data.ts
+++ b/app/src/hooks/use-history-data.ts
@@ -17,6 +17,7 @@ const PACKAGE_MANAGERS = [
   "deno",
   "bun",
   "vlt",
+  "vlt-npm",
   "aube",
   "upm",
   "nx",
diff --git a/app/src/lib/get-icons.ts b/app/src/lib/get-icons.ts
index 6f8e26abde..35a306926f 100644
--- a/app/src/lib/get-icons.ts
+++ b/app/src/lib/get-icons.ts
@@ -47,6 +47,7 @@ const packageManagerMap: Partial<Record<PackageManager, LucideIcon>> = {
   berry: Berry,
   zpm: Zpm,
   vlt: Vlt,
+  "vlt-npm": Vlt,
 };
 
 const frameworkMap: Partial<Record<Fixture, LucideIcon>> = {
diff --git a/app/src/lib/utils.ts b/app/src/lib/utils.ts
index ae9ab102de..ba23c93885 100644
--- a/app/src/lib/utils.ts
+++ b/app/src/lib/utils.ts
@@ -258,6 +258,7 @@ export const calculateLeaderboard = (
               "bun",
               "deno",
               "vlt",
+              "vlt-npm",
               "aube",
               "upm",
             ].includes(pm),
@@ -533,6 +534,7 @@ export function getPackageManagerDisplayName(
   if (packageManager === "pacquet") return "pnpm (v12)";
   if (packageManager === "berry") return "yarn (berry)";
   if (packageManager === "zpm") return "yarn (zpm)";
+  if (packageManager === "vlt-npm") return "vlt (npm registry)";
   if (packageManager === "turbo") return "turborepo";
   if (packageManager === "vp") return "vite+";
   if (packageManager === "aws") return "AWS CodeArtifact";
diff --git a/app/src/types/chart-data.ts b/app/src/types/chart-data.ts
index 4a42e321c9..eaa4df8794 100644
--- a/app/src/types/chart-data.ts
+++ b/app/src/types/chart-data.ts
@@ -8,6 +8,7 @@ export type PackageManager =
   | "deno"
   | "bun"
   | "vlt"
+  | "vlt-npm"
   | "aube"
   | "upm"
   | "nx"
@@ -57,6 +58,7 @@ export interface PackageManagerVersions {
   deno?: string;
   bun?: string;
   vlt?: string;
+  "vlt-npm"?: string;
   aube?: string;
   upm?: string;
   nx?: string;
@@ -83,6 +85,7 @@ export interface PackageManagerData {
   deno?: number;
   bun?: number;
   vlt?: number;
+  "vlt-npm"?: number;
   aube?: number;
   upm?: number;
   nx?: number;
@@ -103,6 +106,7 @@ export interface PackageManagerData {
   deno_stddev?: number;
   bun_stddev?: number;
   vlt_stddev?: number;
+  "vlt-npm_stddev"?: number;
   aube_stddev?: number;
   upm_stddev?: number;
   nx_stddev?: number;
@@ -123,6 +127,7 @@ export interface PackageManagerData {
   deno_fill?: string;
   bun_fill?: string;
   vlt_fill?: string;
+  "vlt-npm_fill"?: string;
   aube_fill?: string;
   upm_fill?: string;
   nx_fill?: string;
@@ -143,6 +148,7 @@ export interface PackageManagerData {
   deno_count?: number;
   bun_count?: number;
   vlt_count?: number;
+  "vlt-npm_count"?: number;
   aube_count?: number;
   upm_count?: number;
   nx_count?: number;
@@ -163,6 +169,7 @@ export interface PackageManagerData {
   deno_dnf?: boolean;
   bun_dnf?: boolean;
   vlt_dnf?: boolean;
+  "vlt-npm_dnf"?: boolean;
   aube_dnf?: boolean;
   upm_dnf?: boolean;
   nx_dnf?: boolean;
@@ -214,6 +221,7 @@ export interface PackageCountData {
   deno?: PackageCountEntry;
   bun?: PackageCountEntry;
   vlt?: PackageCountEntry;
+  "vlt-npm"?: PackageCountEntry;
   aube?: PackageCountEntry;
   upm?: PackageCountEntry;
   nx?: PackageCountEntry;
@@ -242,6 +250,7 @@ export interface ProcessCountData {
   deno?: PackageCountEntry;
   bun?: PackageCountEntry;
   vlt?: PackageCountEntry;
+  "vlt-npm"?: PackageCountEntry;
   aube?: PackageCountEntry;
   upm?: PackageCountEntry;
   nx?: PackageCountEntry;
diff --git a/bench b/bench
index 561e9b82cd..188edba392 100755
--- a/bench
+++ b/bench
@@ -33,6 +33,7 @@ AVAILABLE_PMS=(
   pnpm11
   pacquet
   vlt
+  vlt-npm
   bun
   deno
   aube
diff --git a/scripts/clean-helpers.sh b/scripts/clean-helpers.sh
index 54e2f73d1e..efb799d88b 100644
--- a/scripts/clean-helpers.sh
+++ b/scripts/clean-helpers.sh
@@ -236,12 +236,13 @@ clean_git() {
 }
 
 clean_workspace_protocol() {
-  echo "Restoring package.json files (undo workspace: protocol changes)..."
+  echo "Restoring package.json and vlt.json files (undo workspace: protocol and registry changes)..."
   if command -v git &> /dev/null && git rev-parse --git-dir > /dev/null 2>&1; then
     # Restore each path independently. A single `git checkout -- packages/
     # package.json` fails as a whole when `packages/` does not exist (most
     # fixtures are not monorepos), leaving package.json un-restored.
     git checkout -- package.json 2>/dev/null || true
+    git checkout -- vlt.json 2>/dev/null || true
     [ -e packages ] && git checkout -- packages/ 2>/dev/null || true
   fi
 }
diff --git a/scripts/collect-package-count.js b/scripts/collect-package-count.js
index a522685233..9a1d0fdbc2 100644
--- a/scripts/collect-package-count.js
+++ b/scripts/collect-package-count.js
@@ -28,6 +28,7 @@ const countFiles = [
   { filename: 'pnpm11-count.txt', pmName: 'pnpm11' },
   { filename: 'pacquet-count.txt', pmName: 'pacquet' },
   { filename: 'vlt-count.txt', pmName: 'vlt' },
+  { filename: 'vlt-npm-count.txt', pmName: 'vlt-npm' },
   { filename: 'bun-count.txt', pmName: 'bun' },
   { filename: 'deno-count.txt', pmName: 'deno' },
   { filename: 'aube-count.txt', pmName: 'aube' },
@@ -94,6 +95,17 @@ if (!pmName || !countData) {
   process.exit(0);
 }
 
+// vlt-npm uses the same vlt binary and lockfile format as vlt, so
+// package-count.sh infers "vlt" for both. If vlt-npm was benchmarked
+// (output logs exist) but has no dedicated count, copy vlt's count.
+if (result['vlt'] && !result['vlt-npm']) {
+  const vltNpmLogs = fs.readdirSync(outputFolder).filter(f => f.startsWith('vlt-npm-output-'));
+  if (vltNpmLogs.length > 0) {
+    result['vlt-npm'] = { ...result['vlt'] };
+    console.log('Copied vlt package count to vlt-npm (same lockfile format)');
+  }
+}
+
 // Save the updated result back to the JSON file
 fs.writeFileSync(packageCountPath, JSON.stringify(result, null, 2));
 
diff --git a/scripts/collect-process-count.js b/scripts/collect-process-count.js
index 1e26176be4..754c234f3f 100644
--- a/scripts/collect-process-count.js
+++ b/scripts/collect-process-count.js
@@ -28,6 +28,7 @@ const countFiles = [
   { filename: 'pnpm11-process-count.txt', pmName: 'pnpm11' },
   { filename: 'pacquet-process-count.txt', pmName: 'pacquet' },
   { filename: 'vlt-process-count.txt', pmName: 'vlt' },
+  { filename: 'vlt-npm-process-count.txt', pmName: 'vlt-npm' },
   { filename: 'bun-process-count.txt', pmName: 'bun' },
   { filename: 'deno-process-count.txt', pmName: 'deno' },
   { filename: 'aube-process-count.txt', pmName: 'aube' },
diff --git a/scripts/generate-chart.js b/scripts/generate-chart.js
index 49b2b55a8f..c676ec75b7 100644
--- a/scripts/generate-chart.js
+++ b/scripts/generate-chart.js
@@ -26,6 +26,7 @@ const COLORS = {
   deno: "#70ffaf",
   bun: "#f472b6",
   vlt: "#000000",
+  "vlt-npm": "#666666",
   nx: "#3b82f6",
   turbo: "#ff1e56",
   vp: "#4f30e8",
diff --git a/scripts/setup.sh b/scripts/setup.sh
index ec4af0a054..a8ecbfb939 100644
--- a/scripts/setup.sh
+++ b/scripts/setup.sh
@@ -114,7 +114,9 @@ NODE_VERSION=$(node -v)
 
 # Output versions
 echo "npm: $NPM_VERSION"
+VLT_NPM_VERSION="$VLT_VERSION"
 echo "vlt: $VLT_VERSION"
+echo "vlt-npm: $VLT_NPM_VERSION"
 echo "yarn: $YARN_VERSION"
 echo "yarn (berry): $BERRY_VERSION"
 echo "yarn (zpm): $ZPM_VERSION"
@@ -133,6 +135,7 @@ echo "node: $NODE_VERSION"
 echo "{
   \"npm\": \"$NPM_VERSION\",
   \"vlt\": \"$VLT_VERSION\",
+  \"vlt-npm\": \"$VLT_NPM_VERSION\",
   \"yarn\": \"$YARN_VERSION\",
   \"berry\": \"$BERRY_VERSION\",
   \"zpm\": \"$ZPM_VERSION\",
diff --git a/scripts/variations/cache+lockfile+node_modules.sh b/scripts/variations/cache+lockfile+node_modules.sh
index 16ee6e0c67..6183221019 100644
--- a/scripts/variations/cache+lockfile+node_modules.sh
+++ b/scripts/variations/cache+lockfile+node_modules.sh
@@ -32,6 +32,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/cache+lockfile.sh b/scripts/variations/cache+lockfile.sh
index 665905c3c5..cb3ea437c0 100644
--- a/scripts/variations/cache+lockfile.sh
+++ b/scripts/variations/cache+lockfile.sh
@@ -32,6 +32,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/cache+node_modules.sh b/scripts/variations/cache+node_modules.sh
index b009d3ac93..57ad0e06ac 100644
--- a/scripts/variations/cache+node_modules.sh
+++ b/scripts/variations/cache+node_modules.sh
@@ -32,6 +32,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/cache.sh b/scripts/variations/cache.sh
index 62f361e251..4a2e7e9f94 100644
--- a/scripts/variations/cache.sh
+++ b/scripts/variations/cache.sh
@@ -32,6 +32,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/ci.sh b/scripts/variations/ci.sh
index 2284bdfeef..a5dd543112 100644
--- a/scripts/variations/ci.sh
+++ b/scripts/variations/ci.sh
@@ -25,6 +25,7 @@ BENCH_CI_ZPM="yarn install --immutable --silent"
 BENCH_CI_PNPM="corepack pnpm@latest install --frozen-lockfile --ignore-scripts --silent"
 BENCH_CI_PACQUET="/tmp/pnpm12/bin/pnpm install --frozen-lockfile --ignore-scripts --silent"
 BENCH_CI_VLT="vlt ci --view=silent"
+BENCH_CI_VLT_NPM="vlt ci --view=silent"
 BENCH_CI_BUN="bun install --frozen-lockfile --ignore-scripts --silent"
 BENCH_CI_DENO="deno install --frozen --quiet"
 BENCH_CI_AUBE="aube ci --ignore-scripts --silent"
@@ -38,6 +39,7 @@ BENCH_COMMAND_ZPM="timeout $BENCH_TIMEOUT $BENCH_CI_ZPM > $BENCH_OUTPUT_FOLDER/z
 BENCH_COMMAND_PNPM="timeout $BENCH_TIMEOUT $BENCH_CI_PNPM > $BENCH_OUTPUT_FOLDER/pnpm-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_PACQUET="timeout $BENCH_TIMEOUT $BENCH_CI_PACQUET > $BENCH_OUTPUT_FOLDER/pacquet-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_VLT="timeout $BENCH_TIMEOUT $BENCH_CI_VLT > $BENCH_OUTPUT_FOLDER/vlt-output-\${HYPERFINE_ITERATION}.log 2>&1"
+BENCH_COMMAND_VLT_NPM="timeout $BENCH_TIMEOUT $BENCH_CI_VLT_NPM > $BENCH_OUTPUT_FOLDER/vlt-npm-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_BUN="timeout $BENCH_TIMEOUT $BENCH_CI_BUN > $BENCH_OUTPUT_FOLDER/bun-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_DENO="timeout $BENCH_TIMEOUT $BENCH_CI_DENO > $BENCH_OUTPUT_FOLDER/deno-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_AUBE="timeout $BENCH_TIMEOUT $BENCH_CI_AUBE > $BENCH_OUTPUT_FOLDER/aube-output-\${HYPERFINE_ITERATION}.log 2>&1"
@@ -51,6 +53,7 @@ BENCH_INSTALL_ZPM="$BENCH_CI_ZPM"
 BENCH_INSTALL_PNPM="$BENCH_CI_PNPM"
 BENCH_INSTALL_PACQUET="$BENCH_CI_PACQUET"
 BENCH_INSTALL_VLT="$BENCH_CI_VLT"
+BENCH_INSTALL_VLT_NPM="$BENCH_CI_VLT_NPM"
 BENCH_INSTALL_BUN="$BENCH_CI_BUN"
 BENCH_INSTALL_DENO="$BENCH_CI_DENO"
 BENCH_INSTALL_AUBE="$BENCH_CI_AUBE"
@@ -94,6 +97,7 @@ BENCH_PREPARE_ZPM="$(ci_prepare "$BENCH_SETUP_ZPM" "yarn install --silent")"
 BENCH_PREPARE_PNPM="$(ci_prepare "$BENCH_SETUP_PNPM" "corepack pnpm@latest install --ignore-scripts --silent")"
 BENCH_PREPARE_PACQUET="$(ci_prepare "$BENCH_SETUP_PACQUET" "/tmp/pnpm12/bin/pnpm install --ignore-scripts --silent")"
 BENCH_PREPARE_VLT="$(ci_prepare "$BENCH_SETUP_VLT" "vlt install --view=silent")"
+BENCH_PREPARE_VLT_NPM="$(ci_prepare "$BENCH_SETUP_VLT_NPM" "vlt install --view=silent")"
 BENCH_PREPARE_BUN="$(ci_prepare "$BENCH_SETUP_BUN" "bun install --ignore-scripts --silent")"
 BENCH_PREPARE_DENO="$(ci_prepare "$BENCH_SETUP_DENO" "deno install --quiet")"
 BENCH_PREPARE_AUBE="$(ci_prepare "$BENCH_SETUP_AUBE" "aube install --ignore-scripts --silent")"
@@ -121,6 +125,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$BENCH_PREPARE_VLT"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$BENCH_PREPARE_VLT_NPM"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$BENCH_PREPARE_BUN"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$BENCH_PREPARE_DENO"} \
diff --git a/scripts/variations/clean.sh b/scripts/variations/clean.sh
index 2737666c34..90893b2fb7 100644
--- a/scripts/variations/clean.sh
+++ b/scripts/variations/clean.sh
@@ -32,6 +32,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/common.sh b/scripts/variations/common.sh
index fa846b0b24..3e07d62726 100644
--- a/scripts/variations/common.sh
+++ b/scripts/variations/common.sh
@@ -31,16 +31,16 @@ else
 fi
 
 # Defines configurable values for the benchmark
-BENCH_INCLUDE="${BENCH_INCLUDE:=npm,yarn,berry,zpm,pnpm,pacquet,vlt,bun,deno,aube,upm,nx,turbo,vp,node}"
+BENCH_INCLUDE="${BENCH_INCLUDE:=npm,yarn,berry,zpm,pnpm,pacquet,vlt,vlt-npm,bun,deno,aube,upm,nx,turbo,vp,node}"
 BENCH_WARMUP="${BENCH_WARMUP:=2}"
 BENCH_RUNS="${BENCH_RUNS:=5}"
 # Per-command timeout in seconds (default: 5 minutes).
 # If a single install exceeds this, it is killed. hyperfine --ignore-failure
 # lets the suite continue; the timed-out run records as a failure.
 BENCH_TIMEOUT="${BENCH_TIMEOUT:=300}"
-for pm in npm yarn berry zpm pnpm pacquet vlt bun deno aube upm nx turbo vp node; do
-  CHOICE=$(echo "$pm" | tr '[:lower:]' '[:upper:]')
-  if echo "$BENCH_INCLUDE" | grep -qw "$pm"; then
+for pm in npm yarn berry zpm pnpm pacquet vlt vlt-npm bun deno aube upm nx turbo vp node; do
+  CHOICE=$(echo "$pm" | tr '[:lower:]' '[:upper:]' | tr '-' '_')
+  if echo ",$BENCH_INCLUDE," | grep -qF ",$pm,"; then
     # Only allow nx, turbo, vp, node for task-runner variations (run, build, build-cache)
     if [[ "$pm" == "nx" || "$pm" == "turbo" || "$pm" == "vp" || "$pm" == "node" ]]; then
       if [[ "$BENCH_VARIATION" = "run" || "$BENCH_VARIATION" = "build" || "$BENCH_VARIATION" = "build-cache" ]]; then
@@ -74,6 +74,7 @@ BENCH_SETUP_PNPM="npm pkg delete packageManager >/dev/null 2>&1 || true"
 
 BENCH_SETUP_PACQUET="npm pkg delete packageManager >/dev/null 2>&1 || true"
 BENCH_SETUP_VLT="node $BENCH_SCRIPTS/add-workspace-protocol.js . >> $BENCH_OUTPUT_FOLDER/vlt-prepare.log 2>&1"
+BENCH_SETUP_VLT_NPM="node $BENCH_SCRIPTS/add-workspace-protocol.js . >> $BENCH_OUTPUT_FOLDER/vlt-npm-prepare.log 2>&1; vlt config set registries.npm=https://registry.npmjs.org/ --config=project >> $BENCH_OUTPUT_FOLDER/vlt-npm-prepare.log 2>&1"
 BENCH_SETUP_BUN=""
 BENCH_SETUP_DENO=""
 BENCH_SETUP_AUBE="npm pkg delete packageManager >/dev/null 2>&1 || true"
@@ -103,6 +104,8 @@ BENCH_INSTALL_PNPM="corepack pnpm@latest install --ignore-scripts --silent"
 BENCH_INSTALL_PACQUET="/tmp/pnpm12/bin/pnpm install --ignore-scripts --silent"
 # vlt uses the npm registry alias configured by each fixture's vlt.json.
 BENCH_INSTALL_VLT="vlt install --view=silent"
+# vlt-npm uses the same vlt binary but with the npm registry (set by BENCH_SETUP_VLT_NPM).
+BENCH_INSTALL_VLT_NPM="vlt install --view=silent"
 BENCH_INSTALL_BUN="bun install --ignore-scripts --silent"
 BENCH_INSTALL_DENO="deno install --quiet"
 BENCH_INSTALL_AUBE="aube install --ignore-scripts --silent"
@@ -115,6 +118,7 @@ BENCH_COMMAND_ZPM="timeout $BENCH_TIMEOUT $BENCH_INSTALL_ZPM > $BENCH_OUTPUT_FOL
 BENCH_COMMAND_PNPM="timeout $BENCH_TIMEOUT $BENCH_INSTALL_PNPM > $BENCH_OUTPUT_FOLDER/pnpm-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_PACQUET="timeout $BENCH_TIMEOUT $BENCH_INSTALL_PACQUET > $BENCH_OUTPUT_FOLDER/pacquet-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_VLT="timeout $BENCH_TIMEOUT $BENCH_INSTALL_VLT > $BENCH_OUTPUT_FOLDER/vlt-output-\${HYPERFINE_ITERATION}.log 2>&1"
+BENCH_COMMAND_VLT_NPM="timeout $BENCH_TIMEOUT $BENCH_INSTALL_VLT_NPM > $BENCH_OUTPUT_FOLDER/vlt-npm-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_BUN="timeout $BENCH_TIMEOUT $BENCH_INSTALL_BUN > $BENCH_OUTPUT_FOLDER/bun-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_DENO="timeout $BENCH_TIMEOUT $BENCH_INSTALL_DENO > $BENCH_OUTPUT_FOLDER/deno-output-\${HYPERFINE_ITERATION}.log 2>&1"
 BENCH_COMMAND_AUBE="timeout $BENCH_TIMEOUT $BENCH_INSTALL_AUBE > $BENCH_OUTPUT_FOLDER/aube-output-\${HYPERFINE_ITERATION}.log 2>&1"
@@ -151,8 +155,8 @@ collect_package_count() {
   ls -la "$BENCH_OUTPUT_FOLDER"
 
   # Prints the output of each install
-  for pm in npm yarn berry zpm pnpm pacquet vlt bun deno aube upm nx turbo vp node; do
-    if echo "$BENCH_INCLUDE" | grep -qw "$pm"; then
+  for pm in npm yarn berry zpm pnpm pacquet vlt vlt-npm bun deno aube upm nx turbo vp node; do
+    if echo ",$BENCH_INCLUDE," | grep -qF ",$pm,"; then
       for i in {0..9}; do
         echo "-- Reading output of $pm install $i ---"
         log_file="$BENCH_OUTPUT_FOLDER/${pm}-output-$i.log"
@@ -190,6 +194,7 @@ collect_process_count() {
     [pnpm]="$BENCH_SETUP_PNPM"
     [pacquet]="$BENCH_SETUP_PACQUET"
     [vlt]="$BENCH_SETUP_VLT"
+    [vlt-npm]="$BENCH_SETUP_VLT_NPM"
     [bun]="$BENCH_SETUP_BUN"
     [deno]="$BENCH_SETUP_DENO"
     [aube]="$BENCH_SETUP_AUBE"
@@ -203,6 +208,7 @@ collect_process_count() {
     [pnpm]="$BENCH_INSTALL_PNPM"
     [pacquet]="$BENCH_INSTALL_PACQUET"
     [vlt]="$BENCH_INSTALL_VLT"
+    [vlt-npm]="$BENCH_INSTALL_VLT_NPM"
     [bun]="$BENCH_INSTALL_BUN"
     [deno]="$BENCH_INSTALL_DENO"
     [aube]="$BENCH_INSTALL_AUBE"
@@ -216,13 +222,14 @@ collect_process_count() {
     [pnpm]="$BENCH_INCLUDE_PNPM"
     [pacquet]="$BENCH_INCLUDE_PACQUET"
     [vlt]="$BENCH_INCLUDE_VLT"
+    [vlt-npm]="$BENCH_INCLUDE_VLT_NPM"
     [bun]="$BENCH_INCLUDE_BUN"
     [deno]="$BENCH_INCLUDE_DENO"
     [aube]="$BENCH_INCLUDE_AUBE"
     [upm]="$BENCH_INCLUDE_UPM"
   )
 
-  for pm in npm yarn berry zpm pnpm pacquet vlt bun deno aube upm; do
+  for pm in npm yarn berry zpm pnpm pacquet vlt vlt-npm bun deno aube upm; do
     if [ -n "${PM_INCLUDE[$pm]:-}" ]; then
       local prepare_cmd="$BENCH_PREPARE_BASE"
       local setup="${PM_SETUP[$pm]:-}"
diff --git a/scripts/variations/lockfile+node_modules.sh b/scripts/variations/lockfile+node_modules.sh
index 18c4bc9742..8c894eb20c 100644
--- a/scripts/variations/lockfile+node_modules.sh
+++ b/scripts/variations/lockfile+node_modules.sh
@@ -35,6 +35,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/lockfile.sh b/scripts/variations/lockfile.sh
index 55fa2eb9c4..31c3ebd114 100644
--- a/scripts/variations/lockfile.sh
+++ b/scripts/variations/lockfile.sh
@@ -35,6 +35,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \
diff --git a/scripts/variations/node_modules.sh b/scripts/variations/node_modules.sh
index c77d86452c..0aeb0e7aea 100644
--- a/scripts/variations/node_modules.sh
+++ b/scripts/variations/node_modules.sh
@@ -35,6 +35,8 @@ hyperfine --ignore-failure \
   ${BENCH_INCLUDE_PACQUET:+--command-name="pacquet" "$BENCH_COMMAND_PACQUET"} \
   ${BENCH_INCLUDE_VLT:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT")"} \
   ${BENCH_INCLUDE_VLT:+--command-name="vlt" "$BENCH_COMMAND_VLT"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_VLT_NPM")"} \
+  ${BENCH_INCLUDE_VLT_NPM:+--command-name="vlt-npm" "$BENCH_COMMAND_VLT_NPM"} \
   ${BENCH_INCLUDE_BUN:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_BUN")"} \
   ${BENCH_INCLUDE_BUN:+--command-name="bun" "$BENCH_COMMAND_BUN"} \
   ${BENCH_INCLUDE_DENO:+--prepare="$(append_setup "$BENCH_PREPARE_BASE" "$BENCH_SETUP_DENO")"} \