Merge pull request #3 from maitamdev/feat/perf-utils

feat(perf): add performance utilities

Author: maitamdev

src/utils/performance.ts

@@ -0,0 +1,27 @@
+// Performance monitoring utilities
+
+export function measurePerformance(label: string): () => number {
+  const start = performance.now();
+  return () => {
+    const duration = performance.now() - start;
+    console.log(`[Perf] ${label}: ${duration.toFixed(2)}ms`);
+    return duration;
+  };
+}
+
+export function lazyLoadImage(src: string): Promise<HTMLImageElement> {
+  return new Promise((resolve, reject) => {
+    const img = new Image();
+    img.onload = () => resolve(img);
+    img.onerror = reject;
+    img.src = src;
+  });
+}
+
+export function preloadRoute(importFn: () => Promise<unknown>): void {
+  if ('requestIdleCallback' in window) {
+    (window as unknown as { requestIdleCallback: (cb: () => void) => void }).requestIdleCallback(() => importFn());
+  } else {
+    setTimeout(importFn, 200);
+  }
+}