Most slow WordPress sites are not broken. They are carrying too much unused weight. The fastest wins usually come from cleaner hosting, better caching, lighter assets, and fewer blocking scripts.
Start with the stack
Use modern PHP, object caching, compressed images, and a CDN before chasing tiny micro-optimizations. A clean baseline makes every later improvement easier.
Keep the page lean
Audit plugins, remove unused widgets, delay non-critical JavaScript, and treat every new feature as a performance tradeoff.