Valorant has a solid engineering team and invest heavily in optimization, can't speak for the others. I could be misremembering but there was an interesting bug

Valorant has a solid engineering team and invest heavily in optimization, can't speak for the others. I could be misremembering but there was an interesting bug that was featured in an Unreal profiling case study where a Fortnite font was eating ~2ms (or similarly obscene) CPU budget.