WordPress performance is rarely about one magic plugin. It starts with hosting quality, then caching, image strategy, and careful plugin choices.
Begin by measuring. Use Lighthouse, WebPageTest, or your host's metrics to understand whether the bottleneck is TTFB, JavaScript, or image weight.
A good stack usually includes LiteSpeed or Nginx caching, a CDN like Cloudflare, WebP/AVIF images, and a lean theme. Remove unused plugins and defer non-critical scripts.
If your site still struggles after optimization, it may need architectural changes — headless WordPress, better queries, or a managed WordPress host tuned for your traffic.