refactor: set maxIdlePreloads to be constant over time (#7846)

* refactor: set maxIdlePreloads to be constant over time

* chore: changeset

* test: preloader.unit

* chore: typo

Author: maiieul

.changeset/twelve-words-jump.md

@@ -0,0 +1,5 @@
+---
+'@builder.io/qwik': patch
+---
+
+FEAT: maxIdlePreloads is now constant over time so you know for sure how many bundles will be preloaded concurrently during idle.

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

@@ -21,5 +21,5 @@ 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, preLoader.length]).toEqual([1863, 5533]);
+  expect([compressed.length, preLoader.length]).toEqual([1818, 5417]);
 });

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

@@ -78,10 +78,9 @@ export const trigger = () => {
     const inverseProbability = bundle.$inverseProbability$;
     const probability = 1 - inverseProbability;
     const allowedPreloads = graph
-      ? // The more likely the bundle, the more simultaneous preloads we want to allow
-        Math.max(1, config.$maxIdlePreloads$ * probability)
-      : // While the graph is not available, we limit to 2 preloads
-        2;
+      ? config.$maxIdlePreloads$
+      : // While the graph is not available, we limit to 5 preloads
+        5;
     // When we're 99% sure, everything needs to be queued
     if (probability >= 0.99 || preloadCount < allowedPreloads) {
       queue.shift();