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My intel MacBook lags in such a predictable and constant way, as if a process is running constantly at 99% CPU. Makes me a bit suspicious

How much have they /really/ added to the OS (which is enabled on my hardware) and consuming extra resources?

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A while ago I went into a rabbit hole looking for something to support my hunch (which I now confirmed by installing old macos) and found some discussions about graphics/OpenGL APIs being deprecated and removed over time. I have a very uneducated guess that new-macos-on-old-hardware runs some translation for all graphics operations/APIs, which causes perceptible lag when doing _anything_, because everything draws on the screen. It does feel as if the OS is constantly struggling with some background tasks

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