When switching between "All, Gaming, Off topic", the whole page reload instead of only the specified div gets reload.

It would be nice if it's implemented so that only that box gets refreshed.

Clicking on the same "button" should also refresh the data. For example, you already have "All" as selected option, clicking on it again will just refresh it and show the latest activities. This prevent people from constantly refreshing the whole page which hog up a lot of bandwidth, I assume.

It would be a nice feature since many people use that main page for participating the active threads (many = at least 1, that's me).

Even a swapping div requiring a page refresh to reload all the filters would be better than the current setup.

who? what? me? 0_o

Yeah, the site is becoming more and more popular. Any amount of bandwidth cut is huge when multiplied.

umm no. All he has to do is put in three different divs and use the css to show or hide them based on the selection. Then it is very quick with no calls to the db/server.