WordPress site is loading for ever

I get error Error 404 - Not Found

On a page that does work (what-we-believe), it loads for me in a bit over 2 sec. Even faster for GTMetrix. The page scores relatively well for a WP page. There is some room for improvement, but some suggested measures are often difficult to achieve with WP, like eliminate render-blocking resources.
https://gtmetrix.com/reports/www.iwolm.org/AwfKLYJ7/

Improved caching policy can be implemented with some simple .htaccess rules or certain caching plugins. That’s relatively easy to do. The other suggestions may not be worth the effort for the little gain they would deliver.

By understanding what’s causing the slow loading or poor response time it’ll help narrow down the steps you can take to fix it. The most common reasons your WordPress site is slow to load are: Slow or poor quality hosting that doesn’t match your level or traffic or site. No caching or caching plugins in place.