We’ve just tested the forum on your website with different mobile devices. It’s super fast and smooth. It seems something wrong with your mobile internet, browser or device.There is no speed issue on mobile devices. Here is a record:
First make sure you’re not testing as logged-in on mobile. WordPress loads tons of data when you’re login as admin in mobile. The admin panel and bar is too heavy. It doesn’t exist for regular users so the regular users will not be affected.