What are common causes of slow website performance?

Slow website performance usually happens because your site has large, unoptimized images, too many plugins, or excessive HTTP requests that overload the server. Sometimes, poorly written code or too many ads can drag things down. On the server side, slow response times, distant server locations, or lack of caching and CDNs also play a big role. Basically, a mix of heavy content and weak server setups often causes those frustrating delays you want to avoid.