I have experienced this myself.
My main machine at home - a M2 Pro MacBook with 32GB RAM - effortlessly runs whatever I throw at it. It completes heavy tasks in reasonable time such as Xcode builds and running local LLMs.
Work issued machine - an Intel MacBook Pro with 16GB RAM - struggles with Firefox and Slack. However, development takes place on a remote server via terminal, so I do not notice anything beyond the input latency.
A secondary machine at home - an HP 15 laptop from 2013 with an A8 APU and 8GB RAM (4GB OOTB) - feels sluggish at times with Linux Mint, but suffices for the occasional task of checking emails and web browsing by family.
A journaling and writing machine - a ThinkPad T43 from 2005 maxed out with 2GB RAM and Pentium M - runs Emacs snappily on FreeBSD.
There are a few older machines with acceptable usability that don’t get taken out much, except for the infrequent bout of vintage gaming
Thank you for introducing me to KOReader and Kindle jailbreaking.
Fortunately, the Kindle Paperwhite I use is no longer supported, and is compatible with few of the jailbreaks out there.
A good rabbit hole to dive into over the weekend.