diff --git a/packages/nitro/src/rollup/timing.ts b/packages/nitro/src/rollup/timing.ts
index f05e0d2b4d..7b1fd3c95a 100644
--- a/packages/nitro/src/rollup/timing.ts
+++ b/packages/nitro/src/rollup/timing.ts
@@ -7,7 +7,12 @@ const TIMING = 'global.__timing__'
 
 const iife = code => `(function() { ${code.trim()} })();`.replace(/\n/g, '')
 
-const HELPER = TIMING + '=' + iife(`
+// https://gist.github.com/pi0/1476085924f8a2eb1df85929c20cb43f
+const POLYFILL = `const global="undefined"!=typeof globalThis?globalThis:void 0!==o?o:"undefined"!=typeof self?self:{};
+global.process = global.process || {};
+const o=Date.now(),t=()=>Date.now()-o;global.process.hrtime=global.process.hrtime||(o=>{const e=Math.floor(.001*(Date.now()-t())),a=.001*t();let l=Math.floor(a)+e,n=Math.floor(a%1*1e9);return o&&(l-=o[0],n-=o[1],n<0&&(l--,n+=1e9)),[l,n]});`
+
+const HELPER = POLYFILL + iife(`
 const hrtime = global.process.hrtime;
 const start = () => hrtime();
 const end = s => { const d = hrtime(s); return ((d[0] * 1e9) + d[1]) / 1e6; };
@@ -16,7 +21,7 @@ const _s = {};
 const metrics = [];
 const logStart = id => { _s[id] = hrtime(); };
 const logEnd = id => { const t = end(_s[id]); delete _s[id]; metrics.push([id, t]); console.log('◈', id, t, 'ms'); };
-return { hrtime, start, end, metrics, logStart, logEnd };
+${TIMING} = { hrtime, start, end, metrics, logStart, logEnd };
 `)
 
 export function timing (_opts: Options = {}): Plugin {
diff --git a/packages/nitro/src/targets/worker.ts b/packages/nitro/src/targets/worker.ts
index 6f2eaa5fc5..1c8429dae0 100644
--- a/packages/nitro/src/targets/worker.ts
+++ b/packages/nitro/src/targets/worker.ts
@@ -1,22 +1,11 @@
 import { SLSTarget } from '../config'
 
-// https://gist.github.com/pi0/1476085924f8a2eb1df85929c20cb43f
-
-const polyfill = `
-const exports = {};
-const module = { exports };
-const global = typeof globalThis !== 'undefined' ? globalThis : "undefined" !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
-global.process = global.process || {};
-(function(){const o=Date.now(),t=()=>Date.now()-o;global.process.hrtime=o=>{const e=Math.floor(.001*(Date.now()-t())),n=.001*t();let a=Math.floor(n)+e,r=Math.floor(n%1*1e9);return o&&(a-=o[0],r-=o[1],r<0&&(a--,r+=1e9)),[a,r]};})();
-`
-
 export const worker: SLSTarget = {
   entry: null, // Abstract
   node: false,
   minify: true,
   hooks: {
     'rollup:before' ({ rollupConfig }) {
-      rollupConfig.output.intro = polyfill + rollupConfig.output.intro
       rollupConfig.output.format = 'iife'
     }
   }