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For iOS, we have a product that automatically makes many improvements to load times and latency to allow engineers to focus on UX/UI rather than low level perf like so many do

http://createwithcaffeine.com

why not just let the designers focus on that.

They totally can. Main point is that we free up all engineering hours otherwise spent on optimizing performance.

A perfectly reasonable observation but I'm sure there have to be counterexamples of engineers who are great product designers. Now I just have to go and find them :)

Performance is UX.