UE5 added:
On Demand Shader Compilation (ODSC) - Only compile shaders that are used to draw instead of compiling every shader in each Material’s shader map on PostLoad. This is an experimental feature that is still being developed. This change ensures the editor only compiles shaders it needs to render, resulting in approximately 60% less shaders being compiled and faster start-up times for the editor when opening maps.
DefaultEngine.ini:
[SystemSettings]
r.ShaderCompiler.JobCacheDDC=1