Need help finding what's slowing this scene down

Development Platform & Builds Debugging, Optimization, & Profiling
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Here is an image from Unreal insights. The frame is 2112. I did nothing but start an insight and just sit at the editor. The editor was chugging around 2fps. I’m using Unreal for rendering animations, not (at the moment) for game development. (Actual utrace files are files linked at the bottom)

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This is frame 1940 of the second insight I captured, mere minutes after the first.

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I did nothing but leave UE5 in the background for a few minutes. When I went to grab the second insight (posted above) suddenly the editor was running smooth. (60-40fps) I’m trying my best to decode what’s shown here, but I just don’t know enough about profiling. I only recently switched from Blender to Unreal.

This is my editor view.

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Here’s a last trace where I started in unlit mode and switched to lit view.

I’m using a material with a subsurface profile, and a masked transparent material for an invisible eyebrow mesh (To which I’m planning to attach the eyebrow groom)
I have a GTX 1070 with an i5 3570k (I’m poor, sorry) I think I have VSM on, no nanite’s being used, Lumen’s on with low settings (because Screen space GI is goes nuts most of the time.) Use less CPU in the background is disabled. Editor is smooth when using unlit mode.

I’d be very grateful if someone can help me figure out what’s causing this seemingly random editor slowdown.

Here is the link to the .utrace files
(File order according to last four digits of name)
0604 - First ‘laggy’ editor trace
4540 - ‘Smoother’ editor trace
0412 - ‘Unlit to lit’ editor trace

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I have a suspicion that I had Blender open in the background. I can’t confirm this because reopening Blender after I rebooted my PC and restarted Unreal didn’t reproduce the issue. Most of the terms in the insights window don’t make sense to me yet, so I won’t mark this reply as an answer.

Anyway, if someone else is having an issue like this, check if any other program is using up resources, or if ‘use less cpu’ (when in background) is checked, make sure no process is ‘drawing on top’ of Unreal and forcing UE to use less power.