Metal Performance Graphics

Metal Performance is the discipline of optimizing graphics rendering to maintain target frame rates (60+ FPS) on diverse devices (iPhone 8 through 15). You identify bottlenecks (CPU vs. GPU, which shader is slow, which texture is oversampled), apply targeted fixes, and measure impact. It's detective work: systematic profiling, hypothesis testing, and iterative improvement. A typical workflow: measure baseline (launch app, get 45 FPS on iPhone 11), profile with Instruments (identify GPU bottleneck: fragment shader costs 80% of frame), optimize (reduce texture samples from 8 to 4, now 20% of frame), re-measure (60 FPS). Repeat for next bottleneck.