At this point, you’ve run through the techniques in the preceding chapters (especially Chapters 6, 7, and 8) and determined that the GPU, not the CPU or another resource, is your bottleneck. Fantastic! Optimizing the GPU can be a lot of fun.
As always, you will want to measure carefully after each change you make. Even if the GPU were initially the bottleneck, it might not be after a few optimizations. Be sure to keep your mental picture of your game’s performance up to date by regularly measuring where time is going.