*Steps to reproduce:*

1. Have a project with lots and lots of individual shaders.  A production example of a project with 1000 VFX Assets resulted in over 15k individual shaders.  Shader compilation during build takes > 1hour on i9-10980xe

2. Build the project, watch CPU utilisation during shader compilation stage.

*Actual results:* Shader compilation time during build can be incredibly slow as the shaders are compiling linearly on a single-thread.  The number of shader-variants (post-stripping) should be very low so this scenario is not taking advantage of shader-variant multi-threading.

*Expected results:* Individual shaders are compiled over multiple threads to take advantage of multi-threading.

*Reproducible with versions:* All

*Not reproducible with versions:* 

*Can’t test with versions:* 

*Tested on (OS):* 

*Notes:*
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