diff --git a/src/feature_flags.ts b/src/feature_flags.ts
index 7a175f2d5..79946583c 100644
--- a/src/feature_flags.ts
+++ b/src/feature_flags.ts
@@ -20,6 +20,12 @@ export const defaultFlags: Record<string, boolean> = {
 
   // Load configuration from per-function JSON files.
   project_deploy_configuration_api_use_per_function_configuration_files: false,
+
+  // Enable runtime cache for NFT
+  zisi_nft_cache_changes: false,
+
+  // Raise file IO limit for NFT
+  zisi_nft_higher_fileio_limit: false,
 }
 
 export type FeatureFlag = keyof typeof defaultFlags
diff --git a/src/runtimes/node/bundlers/nft/index.ts b/src/runtimes/node/bundlers/nft/index.ts
index d8b91f1fa..2d9fa3ea9 100644
--- a/src/runtimes/node/bundlers/nft/index.ts
+++ b/src/runtimes/node/bundlers/nft/index.ts
@@ -99,9 +99,9 @@ const traceFilesAndTranspile = async function ({
     reasons,
   } = await nodeFileTrace([mainFile], {
     // Default is 1024. Allowing double the fileIO in parallel makes nft faster, but uses a little more memory.
-    fileIOConcurrency: 2048,
+    fileIOConcurrency: featureFlags.zisi_nft_higher_fileio_limit ? 2048 : 1024,
     base: basePath,
-    cache: cache.nftCache,
+    cache: featureFlags.zisi_nft_cache_changes ? cache.nftCache : undefined,
     ignore: ignoreFunction,
     readFile: async (path: string) => {
       try {