What is Optimising?

To optimise a website is about wearing the user's glasses. There are several acronyms (SEO, UX, UI) together with Speed etc that overlap. And sometimes contradiction. On one side you have the user and on the other side you have the designer that should create a stunning site with lots of images and creative buttons take aeons to load and hide the purpose of the site.

Clean sites could sometimes be dull, but often get the job done faster.

What is the purpose of the site?
What do you want the visitor to do?
Is it fast enough?
Is it useful?
Is it accessible?
Is it easy to navigate?
Is the code behind correct?

This optimise section is about measuring and getting answers to some of these questions. The free tools in this section are sometimes overlapping. Speed and SEO are overlapping. I appreciate your feedback.