The target time (in ms) to spend precompiling each frame when in the background 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 0.0 (off).
Usage
r.ShaderPipelineCache.BackgroundBatchTime [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
