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#rb jonathan.adamczewski #preflight 626984b40d4ac78d717f075b Initial testing has shown this PCH flag improves clang compile time by up to 20% This flag is the default for clang-cl so it already applies to windows clang builds. Other clang based platforms will be supported as additional testing is done. https://reviews.llvm.org/D69585 Linux UnrealEditor Development: - Before Total CPU Time: 114072.34375 s - Before UBT Run Time: 00:26:05 - After Total CPU Time: 86165.671875 s - After UBT Run Time: 00:20:43 Total CPU Time improvement 24.46% UBT Run Time improvement 20.58% Linux UnrealGame Development: - Before Total CPU Time: 23445.140625 s - Before UBT Run Time: 00:09:13 - After Total CPU Time: 18492.71875 s - After UBT Run Time: 00:07:52 Total CPU Time improvement 21.12% UBT Run Time improvement 13.56% [CL 19943838 by Joe Kirchoff in ue5-main branch]