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Mobile game now requires massive amount of PSO to pre-warm to prevent CPU hitching during game play.
Even after removing redundant permutations, it still requires minutes to warmup the cache on mainstream devices.
Luckily, UE5 gives us a solution, we can compile PSO in async style in different android services(A service is a long running background task in Android, kind like a separate process.) to speed up the process.
https://github.com/EpicGames/UnrealEngine/commit/aa7ba3ecfd05d3d2b9a12c9d2d4131b9d78e3a42
https://github.com/EpicGames/UnrealEngine/commit/bde84ad858735d44180a1c9e1a749a1350a4906f
This works fine in OpenGL RHI, it gives us a 2x compile time boost.
But it's worse in Vulkan RHI. Both approach looks identical, i wonder if there's any restriction in vulkan's driver implementation that limits this use pattern.
Thank you for returning to share the solution you found with the community!