In my experience, a server response time of several 100ms is "slow" for example Laravel with a bunch of Eloquent relationships. Drupal can also easily run thous

In my experience, a server response time of several 100ms is "slow" for example Laravel with a bunch of Eloquent relationships. Drupal can also easily run thousands of queries per page load and Magento is possibly even worse. This can be easily cached and optimised though. And it doesn't really make that much of a difference compared to asset loading. As in, a dozen js / css files and a bunch of images. Even when you compress / gzip them as best as you can and load from CDN, they still tend to take up an excruciating amount of time. The article is good but very "beginner". The more challenging stuff is browser caching with htaccess rules etc. Google Page Speed tests are actually very useful here and if you follow all their advice you end up with a very noticeably faster site.