https://www.cpubenchmark.net/compare/Intel-Celeron-N2830-vs-...
It took 700ms or so for my server process to even start on a r.pi - I'd noticed a brief delay on my laptop, but it was so awful on the pi that I ended up spending the whole weekend profiling and optimizing. Anyway, come Monday I pulled the changes onto my fancy laptop and they made a noticable difference in subtle responsiveness. Everything just felt faster. I probably wouldn't have even noticed if I didn't spend that time programming on the pi.
Facebook has "slow internet thursdays" or something, where once a week developers can opt in to experience their internal facebook dev environments in the same way it feels for people on slow connections in poorer countries. I think that sort of thing would be good for all of us. Programming in constrained environments makes our software work better everywhere.
There are several race conditions in many webpages related to waiting for video or images to load.
Tangentially my late 2018 i5 MBA feels sluggish compared to my 2014 MBP. Simple things like switching windows are noticeably slower and janky. Unfortunately my 2014 MBP has an no longer supported NVidia GPU by Chrome/Firefox/Photoshop so I may have to upgrade but I know it will basically feel no different than what I have except I'll have the touch bar which I'm not really interested in.
I believe there is an option in the Performance pane to throttle the CPU in Chrome.
Some games supposedly have been optimised similarly by running parts of it on a C64 or Amiga. I cant recall the game or studio but John Carmack comes to mind.