Optimizing Linux for Slow Computers
There are some things you must have in mind when migrating to Linux systems. Even if you have a top of the line Intel Core i7 Kaby Lake, 32GB of RAM, 2TB M.2 SSDs, you may still benefit from the optimizations I will talk about.
One of the best resources is Arch Linux's Wiki page on "Improving Performance". You don't need everything there but it's a comprehensive resource that any enthusiast must read.
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