It's like making a surgeon do a test on the Operation game from 80s. He could be excelling at that or fail, in both cases it won't be the actual working conditions.
Not every developers do need to produce very performant code and it's not making them less good.
Nowadays also if performance matters, the solution might be outside of micro optimizing a few lines to maybe use like Rust or maybe the solution is to use gRPC for a faster network throughput, etc.
A good dev learns quick.
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