You’d think that games would max out your cpu or gpu or ram and THEN start to have performance problems, but most games can have fps drops when only using about 5-10% of all resources available to them
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Imagine you’re in a store. It’s not too busy, they have 6 staff members and 4 registers, but only 2 are in use cause it’s pretty quiet. The rest are doing other jobs, stocking, cleaning, helping old people find the canned vegetables etc.
Then you get a rush of people and the 2 registers aren’t keeping up so they need to get the other registers open to keep up, but now there are less staff to clean up the spilled artichokes on isle 2 and Mrs Franklin can’t find anyone to point her at the mushroom soup.
Power saving and efficiency heuristics mean that is very very rare for the various resources to be maximally utilized, instead there are local bottlenecks that cause delays. Disk to memory/vRAM to CPU/GPU are pipelines that aren’t always filled to capacity, but just because there are “free cycles” doesn’t mean you can get the work you need done instantly because the inputs haven’t arrived yet.
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