Here is a small list containing multiple tips to get the best Shufflehound theme loading time.

1. Use PHP 7.0 or later version (very important)
2. Enable PHP module OPCache (very important)
3. Install/use Autoptimize plugin or other CSS/JS file minifying plugin (very important)
4. Install/use WP Super Cache plugin or other caching plugin you prefer (very important)
5. Install/use EWWW Image Optimizer plugin or other image optimization plugin (important)
6. Remove or deactivate unused plugins (important)
7. Use good host services to decrease server response time
8. Use Content Deliver Network services like KeyCDN or Cloudflare