A slow site kills conversions. Here is how to make WordPress fly.
1. Choose a Fast VPS
Shared hosting is the #1 cause of slow sites. move to a High Frequency VPS like Vultr or RockHoster.
2. Cache Everything
Use plugins like WP Rocket or server-side caching like Redis/Varnish.
3. Optimize Images
Convert images to WebP. Large images are the biggest bandwidth hog.