He optimized rendering 10x only to find take_action was the real bottleneck
YouJiacheng · x · 2026-11-08
YouJiacheng shared a funny profiling fail: trusting RoboTwin's cost breakdown that raytracing rendering was the major bottleneck, he optimized it from 30ms to 3ms/frame on a 3090 — only to discover that takeaction was actually the real bottleneck on that hardware. His labmates had all told him rendering was the slowest part.
A classic reminder for performance work: don't blindly trust someone else's profile — bottlenecks shift across hardware and configs, so re-measure in your own environment first.
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