i dont understand... it makes me waste a lot of time, why force to search new servers instead of just refresh existing list of servers?

when i click on multiplayer it takes to long with "updating" thing

a quick refresh should be enough, and optionally search for new servers like in most server browsers

if you want to know how many players are on each server then you need to actually ask each and every one, and that's what takes the time.
ideally this wouldn't block the UI, but at some point the servers (may) need to be resorted, which would interrupt it either way.

sb_infospersec "1000"
sb_pingspersec "1000"

:-)