perf(preloader): bundle at 100% => dynamic at 95%

Author: wmertens

packages/qwik/src/core/preloader/preloader.unit.ts

@@ -21,6 +21,6 @@ test('preloader script', () => {
    * dereference objects etc, but that actually results in worse compression
    */
   const compressed = compress(Buffer.from(preLoader), { mode: 1, quality: 11 });
-  expect(compressed.length).toBe(1706);
-  expect(preLoader.length).toBe(5082);
+  expect(compressed.length).toBe(1722);
+  expect(preLoader.length).toBe(5107);
 });

packages/qwik/src/core/preloader/queue.ts

@@ -179,12 +179,16 @@ export const adjustProbabilities = (
       const prevAdjust = dep.$factor$;
       /**
        * The chance that a dep won't be loaded is 1-(the chance that the dep will be loaded)*(the
-       * chance that the current bundle will be loaded)
+       * chance that the current bundle will be loaded).
        *
        * We can multiply this chance together with all other bundle adjustments to get the chance
-       * that a dep will be loaded given all the chances of the other bundles
+       * that a dep will be loaded given all the chances of the other bundles.
+       *
+       * But when we're very likely to load the current bundle, make the dynamic imports more likely
+       * too.
        */
-      const newInverseProbability = 1 - dep.$probability$ * probability;
+      const newInverseProbability =
+        dep.$probability$ !== 1 && adjustFactor < 0.1 ? 0.05 : 1 - dep.$probability$ * probability;
 
       /** We need to undo the previous adjustment */
       const factor = newInverseProbability / prevAdjust;