r_ShadersAsyncCompiling

Enable asynchronous shader compiling
Usage: r_ShadersAsyncCompiling [0/1/2/3]
 0 = off, (stalling) shaders compiling
 1 = on, shaders are compiled in parallel, missing shaders are rendered in yellow
 2 = on, shaders are compiled in parallel, missing shaders are not rendered
 3 = on, shaders are compiled in parallel in precache mode