diff --git a/.github/workflows/perf.yml b/.github/workflows/perf.yml
index 037bb032e0..5d17b85037 100644
--- a/.github/workflows/perf.yml
+++ b/.github/workflows/perf.yml
@@ -198,7 +198,7 @@ jobs:
           done
 
       - name: Setup Vite+
-        uses: voidzero-dev/setup-vp@250f29ce396baf5e8f24498e17c0dfdebabc26eb # v1
+        uses: voidzero-dev/setup-vp@35171c92dd08b67d5a9d3f2a4327800e58396f2a # v1
         with:
           node-version: "24"
           cache: true
diff --git a/packages/vinext/src/routing/app-route-graph.ts b/packages/vinext/src/routing/app-route-graph.ts
index 5e3961554e..4684ee7a1b 100644
--- a/packages/vinext/src/routing/app-route-graph.ts
+++ b/packages/vinext/src/routing/app-route-graph.ts
@@ -1197,7 +1197,7 @@ function discoverSlotSubRoutes(
 
       const subPages = findSlotSubPages(slotDir, matcher);
       for (const { relativePath, pagePath } of subPages) {
-        const subSegments = relativePath.split(path.sep);
+        const subSegments = relativePath.split("/");
         const convertedSubRoute = convertSegmentsToRouteParts(subSegments);
         if (!convertedSubRoute) continue;
 
@@ -1485,7 +1485,7 @@ function findSlotSubPages(slotDir: string, matcher: ValidFileMatcher): SlotSubPa
       const subDir = path.join(dir, entry.name);
       const page = findFile(subDir, "page", matcher);
       if (page) {
-        const relativePath = path.relative(slotDir, subDir);
+        const relativePath = normalizePathSeparators(path.relative(slotDir, subDir));
         results.push({ relativePath, pagePath: page });
       }
       // Continue scanning deeper for nested sub-pages
@@ -1520,8 +1520,8 @@ function findSlotConfigLayoutTreePositions(
   layoutPaths: readonly string[],
 ): number[] {
   return layoutPaths.map((layoutPath) => {
-    const relativeDir = path.relative(slotDir, path.dirname(layoutPath));
-    return relativeDir ? relativeDir.split(path.sep).filter(Boolean).length : 0;
+    const relativeDir = normalizePathSeparators(path.relative(slotDir, path.dirname(layoutPath)));
+    return relativeDir ? relativeDir.split("/").filter(Boolean).length : 0;
   });
 }
 
@@ -1796,9 +1796,9 @@ function computeLayoutTreePositions(appDir: string, layouts: string[]): number[]
     const layoutDir = path.dirname(layoutPath);
     // path.relative tolerates mixed separators and win32 case differences,
     // so an empty result is the separator-agnostic "layout at app root" test.
-    const relative = path.relative(appDir, layoutDir);
+    const relative = normalizePathSeparators(path.relative(appDir, layoutDir));
     if (relative === "") return 0;
-    return relative.split(path.sep).length;
+    return relative.split("/").length;
   });
 }
 
@@ -2130,7 +2130,7 @@ function findMirroredSlotPage(
   };
   let best: Candidate | null = null;
   for (const { relativePath, pagePath } of findSlotSubPages(slotDir, matcher)) {
-    const slotSegments = relativePath.split(path.sep);
+    const slotSegments = relativePath.split("/");
     const slotUrl = convertSegmentsToRouteParts(slotSegments);
     if (!slotUrl) continue;
     if (!patternsCompatible(slotUrl.urlSegments, routeUrl.urlSegments)) continue;