Speed is a system, not a setting
A fast website is rarely the result of one plugin or one setting. It’s the compounding effect of dozens of small decisions made correctly across the front end and back end.
Where the real gains come from
In practice, the biggest wins usually come from a short list: properly sized and compressed images, fewer render-blocking requests, sane caching rules, and minified CSS/JS that hasn’t been bloated by unused plugin code.
Don’t trade speed for functionality you don’t need
The fastest sites are often the ones that said no to something — an extra tracking script, a heavier page builder, an animation library used for one effect. Every dependency has a cost; the question is whether it’s paying for itself.
Measure, don’t assume
Perceived speed and measured speed diverge more often than people expect. Treat performance as something you test against real device and network conditions, not just a lab score.