This ticket is >not< about the server browser being slow, but even if its finished loading all the servers, there are still a lot of community servers missing.
So you can not find a lot of servers in the official launcer unless you connect by direct IP, after they might show up in your Recent tab.
In the DZSA launcher, several online browser monitors or if you do a manual request to the steam master, everything is working.
Some hints in a similar ticket ( https://feedback.bistudio.com/T170263 ) showed in direction of an error on valve side, but it looks like the error is in the dayz browser, as the steam master responds correctly if you send the correct rquest. (see php script below on Steps to reproduce).
We tested this with several players across europe and the outcome was always the same. Changing settings in the steam client "Server browser pings per Minute" is not effecting this issue.
More details below. I think this issue started with the 1.20 update, not 100% sure on this though.
Thank you for looking into it.