Hi i know what the problem is he is compiling shaders when cooking or Packaging or launching the game for the first time, this process that the engine is doing, with the 4.12 up to 4.18 is done automaticly when you start the project the first time, but with the engine 4.19 up to 4.22 this is being done when you cook package or launch the game for the first time, very strange but that is the problem, when the process is done the second time he will be faster and he wont compile anymore,only when you put something new in the game a new level or asset. i hope this helped,and yes the bigger the game is the longer the process wil be mine took 16 hours but now a half hour