The DayZ Launcher is loading servers very slowly because it filters out Chinese servers on the fly and all servers must be loaded. The workaround of filtering out Chinese servers on the Launcher side does not seem like a good solution.
You can see in the video from 3:08 that the loading is faster because there are no Chinese servers to filter out by DayZ Launcher. It takes 4 minutes to load the server list with only 4,530 servers because loading Chinese servers takes 3 minutes even though they are filtered out. If the Launcher does not need to filter out Chinese servers, it can load the full server list in 1 minute. It's 4x slower now.