The target time (in ms) to spend precompiling each frame when cpre-optimizing or 0.0 to disable. When precompiling is faster the batch size will grow and when slower will shrink to attempt to occupy the full amount. Defaults to 10.0 (off).
Usage
r.ShaderPipelineCache.PrecompileBatchTime [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.