diff --git a/packages/cli/src/util/AssetUploader.ts b/packages/cli/src/util/AssetUploader.ts
index 58e77b04..e656a98a 100644
--- a/packages/cli/src/util/AssetUploader.ts
+++ b/packages/cli/src/util/AssetUploader.ts
@@ -39,6 +39,7 @@ import { dirExists } from './files.js';
 import { retryAsync } from './retryAsync.js';
 
 const DEFAULT_PARALLEL_UPLOADS = 7;
+const MAX_PARALLEL_ASSET_READS = 16;
 
 let PARALLEL_UPLOADS = parseInt(process.env['DEVVIT_PARALLEL_UPLOADS'] || '0');
 if (isNaN(PARALLEL_UPLOADS) || PARALLEL_UPLOADS < 1) {
@@ -608,8 +609,9 @@ export async function queryAssets(
   const assets = (await tinyglob(assetsGlob, { filesOnly: true, absolute: true })).filter(
     (asset) => allowedExtensions.length === 0 || allowedExtensions.includes(path.extname(asset))
   );
-  return await Promise.all(
-    assets.map(async (asset) => {
+  return await mapAsyncWithMaxConcurrency(
+    assets,
+    async (asset) => {
       const filename = path.relative(dir, asset).replaceAll(path.sep, '/');
       let file = await fsp.readFile(asset);
 
@@ -630,7 +632,8 @@ export async function queryAssets(
         isWebviewAsset: assetKind === 'Client',
         contents,
       };
-    })
+    },
+    MAX_PARALLEL_ASSET_READS
   );
 }
 
diff --git a/packages/cli/src/util/getAppSourceZip.ts b/packages/cli/src/util/getAppSourceZip.ts
index 2bd14df1..ba886c8d 100644
--- a/packages/cli/src/util/getAppSourceZip.ts
+++ b/packages/cli/src/util/getAppSourceZip.ts
@@ -1,12 +1,14 @@
 import fsp from 'node:fs/promises';
 import path from 'node:path';
 
+import { mapAsyncWithMaxConcurrency } from '@devvit/shared-types/mapAsyncWithMaxConcurrency.js';
 import ignore from 'ignore';
 import JSZip from 'jszip';
 
 import { DevvitCommand } from './commands/DevvitCommand.js';
 
 const ALWAYS_IGNORED_PATHS = Object.freeze(['node_modules', '.env', '.git']);
+const MAX_PARALLEL_SOURCE_READS = 16;
 
 export async function getAppSourceZip(cmd: DevvitCommand): Promise<ArrayBuffer> {
   const zip = new JSZip();
@@ -51,7 +53,7 @@ async function addDirectoryToZip(
   const entries = await fsp.readdir(dir, { withFileTypes: true });
 
   // Process entries in parallel
-  const filePromises: Promise<void>[] = [];
+  const fileCallbacks: (() => Promise<void>)[] = [];
   const dirCallbacks: (() => Promise<void>)[] = [];
 
   for (const entry of entries) {
@@ -71,18 +73,20 @@ async function addDirectoryToZip(
         );
       }
     } else if (entry.isFile()) {
-      // Read files & add them in parallel though
-      filePromises.push(
-        (async () => {
-          const content = await fsp.readFile(fullPath);
-          zipFolder.file(entry.name, content);
-        })()
-      );
+      // Defer file reads so concurrency can be bounded below.
+      fileCallbacks.push(async () => {
+        const content = await fsp.readFile(fullPath);
+        zipFolder.file(entry.name, content);
+      });
     }
   }
 
-  // Wait for all file reads to complete
-  await Promise.all(filePromises);
+  // Read files concurrently without opening every file at once.
+  await mapAsyncWithMaxConcurrency(
+    fileCallbacks,
+    (readFile) => readFile(),
+    MAX_PARALLEL_SOURCE_READS
+  );
 
   // Then, process the directories in serial
   for (const dirCallback of dirCallbacks) {