test: increase memory leak threshold for flaky performance test

Author: fabiovincenzi

test/proxy/performance.test.ts

@@ -226,7 +226,7 @@ describe('HTTP/HTTPS Performance Tests', () => {
       const processingTime = endTime - startTime;
 
       expect(processingTime).toBeLessThan(100); // Should handle errors quickly
-      expect(memoryIncrease).toBeLessThan(2 * KILOBYTE); // Should not leak memory (allow for GC timing)
+      expect(memoryIncrease).toBeLessThan(10 * KILOBYTE); // Should not leak memory (allow for GC timing and normal variance)
     });
 
     it('should handle malformed requests efficiently', async () => {