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Do you have any source taking about GC caused performance issues in those engines?

Too many to post, you can just google “{engine} gc spike” for example.

Heck, there is a whole cottage profession of experts who get called into fix GC related performance issues with Unity.

So are you saying this cottage industry achieves success or the industry formed around an impossible task?

A cottage industry is built around making rocks look good too. Is that an indicator that games are good or bad at making rocks?

I work in performance optimization (I guess the cottage industry you're talking about?) and GC issues haven't been close to top 10 problems in any of the engines or OSes we've dealt with lately, so I'm wondering what you're on about there.

Can you quantify and elaborate more how much GC is an issue for something like Unreal engine?

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