My primary computer for many years until just a few months ago was a 2008 Core 2 Duo MacBook Pro. I remember trying to visit Discord using it quite literally could not navigate, nor could I practically use my laptop for other things when the site was open. I do hope it has changed, but that showed a fundamental problem with their site.
Interestingly, this indirectly led to using my DNS resolver to block a number of sources of gratuitous and abusive Javascript, particularly from ad networks. This sped up many sites, not just the worst, and made my computer feel so much snappier overall.
A happy side effect is that lots of ads simply don't show up. While similar to the purpose of a Pi Hole resolver, I'd rather block the Javascript that loads ads than simply block the ads. I'd be interested to know if the people making block lists for Pi Holes note this distinction.
Running older hardware, observing the results and sometimes doing something about them can go all sorts of good :)