diff --git a/Build/lib/cache-filesystem.ts b/Build/lib/cache-filesystem.ts
index bfdb1e2e..40b6ccb9 100644
--- a/Build/lib/cache-filesystem.ts
+++ b/Build/lib/cache-filesystem.ts
@@ -6,6 +6,7 @@ import { mkdirSync } from 'fs';
 import picocolors from 'picocolors';
 import { fastStringArrayJoin } from './misc';
 import { peek } from 'bun';
+import { performance } from 'perf_hooks';
 
 const identity = (x: any) => x;
 
@@ -78,7 +79,7 @@ export class Cache<S = string> {
     tableName = 'cache',
     type
   }: CacheOptions<S> = {}) {
-    const start = Bun.nanoseconds();
+    const start = performance.now();
 
     this.cachePath = cachePath;
     mkdirSync(this.cachePath, { recursive: true });
@@ -120,7 +121,7 @@ export class Cache<S = string> {
       this.db.exec('VACUUM;');
     }
 
-    const end = Bun.nanoseconds();
+    const end = performance.now();
     console.log(`${picocolors.gray(`[${((end - start) / 1e6).toFixed(3)}ms]`)} cache initialized from ${this.cachePath}`);
   }
 
diff --git a/Build/lib/fetch-assets.ts b/Build/lib/fetch-assets.ts
index 81debfb2..32a2dd5a 100644
--- a/Build/lib/fetch-assets.ts
+++ b/Build/lib/fetch-assets.ts
@@ -1,5 +1,6 @@
 import picocolors from 'picocolors';
 import { defaultRequestInit, fetchWithRetry } from './fetch-retry';
+import { setTimeout } from 'timers/promises';
 
 class CustomAbortError extends Error {
   public readonly name = 'AbortError';
@@ -15,7 +16,7 @@ const sleepWithAbort = (ms: number, signal: AbortSignal) => new Promise<void>((r
   function stop(this: AbortSignal) { reject(this.reason as Error); }
 
   signal.addEventListener('abort', stop, { once: true });
-  Bun.sleep(ms).then(resolve).catch(reject).finally(() => signal.removeEventListener('abort', stop));
+  setTimeout(ms, undefined, { ref: false }).then(resolve).catch(reject).finally(() => signal.removeEventListener('abort', stop));
 });
 
 export async function fetchAssets(url: string, fallbackUrls: string[] | readonly string[]) {
diff --git a/Build/lib/fetch-retry.ts b/Build/lib/fetch-retry.ts
index 1c475152..afee348f 100644
--- a/Build/lib/fetch-retry.ts
+++ b/Build/lib/fetch-retry.ts
@@ -1,5 +1,6 @@
 import retry from 'async-retry';
 import picocolors from 'picocolors';
+import { setTimeout } from 'timers/promises';
 
 // retry settings
 const MIN_TIMEOUT = 10;
@@ -84,7 +85,7 @@ function createFetchRetry($fetch: typeof fetch): FetchWithRetry {
                 if (retryAfter > retryOpts.maxRetryAfter) {
                   return res;
                 }
-                await Bun.sleep(retryAfter * 1e3);
+                await setTimeout(retryAfter * 1e3, undefined, { ref: false });
               }
             }
             throw new ResponseError(res);
diff --git a/Build/trace/index.ts b/Build/trace/index.ts
index 48f71d11..dac69c49 100644
--- a/Build/trace/index.ts
+++ b/Build/trace/index.ts
@@ -4,8 +4,6 @@ import picocolors from 'picocolors';
 const SPAN_STATUS_START = 0;
 const SPAN_STATUS_END = 1;
 
-const NUM_OF_MS_IN_NANOSEC = 1_000_000;
-
 const spanTag = Symbol('span');
 
 export interface TraceResult {
@@ -36,7 +34,7 @@ export interface Span {
 }
 
 export const createSpan = (name: string, parentTraceResult?: TraceResult): Span => {
-  const start = Bun.nanoseconds();
+  const start = performance.now();
 
   let curTraceResult: TraceResult;
 
@@ -45,7 +43,7 @@ export const createSpan = (name: string, parentTraceResult?: TraceResult): Span
   } else {
     curTraceResult = {
       name,
-      start: start / NUM_OF_MS_IN_NANOSEC,
+      start,
       end: 0,
       children: []
     };
@@ -58,9 +56,9 @@ export const createSpan = (name: string, parentTraceResult?: TraceResult): Span
     if (status === SPAN_STATUS_END) {
       throw new Error(`span already stopped: ${name}`);
     }
-    const end = time ?? Bun.nanoseconds();
+    const end = time ?? performance.now();
 
-    curTraceResult.end = end / NUM_OF_MS_IN_NANOSEC;
+    curTraceResult.end = end;
 
     status = SPAN_STATUS_END;
   };