Understanding the 16.6ms Frame Budget
To achieve a consistent 60 frames per second (FPS), your browser game must execute physics simulations, input polling, animation math, and GPU rendering within a strict 16.6-millisecond window per frame. Dropping below this budget causes noticeable stutter (jank) that degrades the player experience.
1. Batching Draw Calls and Geometry Merging
The primary bottleneck in WebGL is rarely raw polygon count; it is CPU-to-GPU state changes caused by excessive individual draw calls. Merging static geometries using InstancedMesh or BufferGeometryUtils allows hundreds of scene objects to be drawn in a single GPU call.
2. Texture Atlasing and Compressed Textures (KTX2 / Basis)
Switching from raw PNG/JPG textures to GPU-native compressed formats like KTX2 with Basis Universal compression drastically slashes VRAM usage and eliminates runtime texture decompression pauses.
3. Object Pooling to Defeat Garbage Collection Spikes
Creating and destroying JavaScript objects (such as bullets, particle effects, or enemies) inside the animation loop triggers frequent Garbage Collection (GC) pauses. Pre-allocating reusable object pools guarantees zero allocation overhead during intense gameplay.