diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index e62d78fdf1b956..71e2b138f753ea 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -547,20 +547,17 @@ export function runOptimizeDeps(
       // is safer than a delete-rename operation.
       const temporaryPath = depsCacheDir + getTempSuffix()
       const depsCacheDirPresent = fs.existsSync(depsCacheDir)
+      if (depsCacheDirPresent) {
+        debug?.(colors.green(`renaming ${depsCacheDir} to ${temporaryPath}`))
+        await safeRename(depsCacheDir, temporaryPath)
+      }
+
       if (isWindows) {
-        if (depsCacheDirPresent) {
-          debug?.(colors.green(`renaming ${depsCacheDir} to ${temporaryPath}`))
-          await safeRename(depsCacheDir, temporaryPath)
-        }
         debug?.(
           colors.green(`renaming ${processingCacheDir} to ${depsCacheDir}`),
         )
         await safeRename(processingCacheDir, depsCacheDir)
       } else {
-        if (depsCacheDirPresent) {
-          debug?.(colors.green(`renaming ${depsCacheDir} to ${temporaryPath}`))
-          fs.renameSync(depsCacheDir, temporaryPath)
-        }
         debug?.(
           colors.green(`renaming ${processingCacheDir} to ${depsCacheDir}`),
         )
@@ -1291,19 +1288,23 @@ export async function cleanupDepsCacheStaleDirs(
     const cacheDir = path.resolve(config.cacheDir)
     if (fs.existsSync(cacheDir)) {
       const dirents = await fsp.readdir(cacheDir, { withFileTypes: true })
+      const promises = []
       for (const dirent of dirents) {
         if (dirent.isDirectory() && dirent.name.includes('_temp_')) {
-          const tempDirPath = path.resolve(config.cacheDir, dirent.name)
-          const stats = await fsp.stat(tempDirPath).catch((_) => null)
-          if (
-            stats?.mtime &&
-            Date.now() - stats.mtime.getTime() > MAX_TEMP_DIR_AGE_MS
-          ) {
-            debug?.(`removing stale cache temp dir ${tempDirPath}`)
-            await fsp.rm(tempDirPath, { recursive: true, force: true })
-          }
+          promises.push(async () => {
+            const tempDirPath = path.resolve(config.cacheDir, dirent.name)
+            const stats = await fsp.stat(tempDirPath).catch((_) => null)
+            if (
+              stats?.mtime &&
+              Date.now() - stats.mtime.getTime() > MAX_TEMP_DIR_AGE_MS
+            ) {
+              debug?.(`removing stale cache temp dir ${tempDirPath}`)
+              await fsp.rm(tempDirPath, { recursive: true, force: true })
+            }
+          })
         }
       }
+      if (promises.length) await Promise.all(promises)
     }
   } catch (err) {
     config.logger.error(err)
diff --git a/packages/vite/src/node/optimizer/optimizer.ts b/packages/vite/src/node/optimizer/optimizer.ts
index 096d0bef2cdd54..c411ec309b8eb6 100644
--- a/packages/vite/src/node/optimizer/optimizer.ts
+++ b/packages/vite/src/node/optimizer/optimizer.ts
@@ -790,17 +790,15 @@ function findInteropMismatches(
   const needsInteropMismatch = []
   for (const dep in discovered) {
     const discoveredDepInfo = discovered[dep]
+    if (discoveredDepInfo.needsInterop === undefined) continue
+
     const depInfo = optimized[dep]
-    if (depInfo) {
-      if (
-        discoveredDepInfo.needsInterop !== undefined &&
-        depInfo.needsInterop !== discoveredDepInfo.needsInterop
-      ) {
-        // This only happens when a discovered dependency has mixed ESM and CJS syntax
-        // and it hasn't been manually added to optimizeDeps.needsInterop
-        needsInteropMismatch.push(dep)
-        debug?.(colors.cyan(`✨ needsInterop mismatch detected for ${dep}`))
-      }
+
+    if (depInfo.needsInterop !== discoveredDepInfo.needsInterop) {
+      // This only happens when a discovered dependency has mixed ESM and CJS syntax
+      // and it hasn't been manually added to optimizeDeps.needsInterop
+      needsInteropMismatch.push(dep)
+      debug?.(colors.cyan(`✨ needsInterop mismatch detected for ${dep}`))
     }
   }
   return needsInteropMismatch