The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
The simultaneous constraints of code quality requirements via AGENTS.md, speed requirements with a quantifiable target objective, and an output accuracy/quality requirement, all do succeed at finding meaningful speedups consistently (atleast 2x-3x)
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Samsung Galaxy S26+ (Verizon, 256GB)