FPS spikes on first run of the level


when I start level at first time, there are some fps spikes when actor/texture is loading into memory, when I restart level, fps spikes are gone. I know there is a workaround with preload level, where are that actors behind widget for loading into memory, but my problem is how to detect these problematic actors/textures, I did stat file from profiler, but I dont know how to identify these problematic objects, also documentation isnt so much clear for me about this measuring. Do you have any tips guys?

Also that mentioned workaround, is it the only way how to solve this fps spikes? I was searching and dont know if asset manager isnt useful for this problems, also was looking at async loading, texture streaming.

Everything what Iam doing is in 4.22 and shipping build.

Thank you for your time.