diff --git a/page/src/Header.tsx b/page/src/Header.tsx
index 973b14e7..fbf2f934 100644
--- a/page/src/Header.tsx
+++ b/page/src/Header.tsx
@@ -3,6 +3,7 @@ import { Helmet } from "react-helmet";
 export interface HeaderProps {
   title: string;
   description: string;
+  preload?: string[];
 }
 
 const image =
@@ -23,6 +24,16 @@ export function Header(props: HeaderProps) {
       <meta name="twitter:title" content={props.title} />
       <meta name="twitter:description" content={props.description} />
       <meta name="twitter:image" content={image} />
+
+      {props.preload?.map((l) => (
+        <link
+          key={`link-${l}`}
+          rel="preload"
+          as={l.endsWith(".js") ? "script" : "fetch"}
+          crossOrigin=""
+          href={`${l}${l.indexOf("?") == -1 ? "?" : "&"}cb=${import.meta.env.VITE_BUILD_TIME}`}
+        />
+      ))}
     </Helmet>
   );
 }
diff --git a/page/src/playground.tsx b/page/src/playground.tsx
index bffecb33..b3aae970 100644
--- a/page/src/playground.tsx
+++ b/page/src/playground.tsx
@@ -206,6 +206,7 @@ export class Playground extends React.Component<
         <Header
           title="Sogen - Playground"
           description="Playground to test and run Sogen, the Windows user space emulator, right in your browser."
+          preload={["./emulator-worker.js", "./analyzer.js", "./analyzer.wasm"]}
         />
         <div className="h-[100dvh] flex flex-col">
           <header className="flex shrink-0 items-center gap-2 border-b p-2 overflow-y-auto">
diff --git a/page/vite.config.ts b/page/vite.config.ts
index 8963950c..b5c43bef 100644
--- a/page/vite.config.ts
+++ b/page/vite.config.ts
@@ -11,4 +11,7 @@ export default defineConfig({
       "@": path.resolve(__dirname, "./src"),
     },
   },
+  define: {
+    "import.meta.env.VITE_BUILD_TIME": JSON.stringify(Date.now()),
+  },
 });