WordPress performance is usually a stack of small decisions, not one magic plugin.
Use a current PHP version
Newer PHP releases are faster and safer. Keep your app compatible and bump the runtime in the panel.
Enable page caching
Full-page cache removes repeated PHP work for anonymous visitors.
Optimize images
Compress uploads and prefer modern formats where your theme supports them.
Audit plugins
Disable what you do not use. Every active plugin has a cost on every request.
Pick NVMe hosting
Disk I/O matters for dynamic sites — NVMe reduces wait time under concurrent traffic.