UE4 to UE5 levels that too long to loads

Hi, for unknow reasons all projects from UE4 to UE5 have levels that take too long to long like 30 min or more! and this each time you want to load these levels, in UE4 it was a matter of time, even when I start a new project in UE4 and migrate that content it takes less than one minute to load these levels!

I have all shaders & distance field compiled! I don’t know why it occurs! any help would be appreciated! thanks