I've got a really quick question. Does music effect performance? I couldn't find it anywhere that says it does. So can somebody please tell me?
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It can on mobile depending on the hardware and what you already have going. It shouldn't take much of a toll on desktop at all.
Probably not because it's a perfect candidate to offload on to a different CPU core and run in parallel. Maybe on a single core system, or a really badly designed browser/OS which can't parallelise it, but I think all modern systems are fine.