No mobile and intensive scripts.
The boards are nearly impossible to run on a potato phone, and take a while to open on a normal phone. The goal of boards is to read text, I don't really need to spend alot of time waiting for pages to load.
The boards site is way to script dependent. It takes forever for the scripts to load all the assets, and it usually ends up with the browser taking a big chunk of the computer memory. This problem is on mobile and desktop.