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What is the purpose of the pass Visibility Command?

I noticed that above pass is very high on my project, but don’t know what is it for and what could be the cause of it

Due to how Unreal waits for occlusion tests/GPU, you will see random holes in your profiling results. Try console command ‘t.MaxFPS 10’ (to manually wait for each frame) and see if your cost shifts to somewhere else.