Investigating an area of my level with a serious drop in FPS for no apparent reason. Does UE4 come with comprehensive tools to help fix/optimize?

Development Platform & Builds Debugging, Optimization, & Profiling
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I’m hoping to find tools to help me investigate what’s causing this, like maybe something that displays what’s being processed and what percent (50% geometry, 20% particles, 10% materials, etc). Can anyone clue me in?

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The Profiler tool

Also take a look at this Stream covers a lot of things.