If you're viewing the Forums on a mobile device and the threads are very hard to read, you're probably seeing the default style instead of the mobile style.
To switch to the mobile style, scroll down to the bottom of the screen and look for the Style Chooser menu on the left. If it says "--LLL-v4", you're seeing the default style.
Touch the menu and select "--Mobile Style", then "Done".
Everything should become much more legible after that.