Your CPU is just a complicated calculator. Applications ask your calculator to do a number of different sums at the same time. Some calculators are faster at returning answers than others. However, applications are both getting better at asking fewer calculations to get to the answer they need, and are also not increasing the complexity of the calculations they’re asking your calculator to work out. The i5 might not be able to do sums quite as fast as the i9, but it can do them fast enough to not cause a really noticeable difference compared to the i9.
However, for people that are asking their calculators to do lots of hard sums (video gamers, servers, video rendering, etc) they do notice the difference and will pay extra for a faster calculator as they’re doing sums hard enough to see a noticeable difference in performance.
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