Stats download can stall server when player joins
When a new player connects, PlayerStats_PlayerBasic_CheckUpdate is called, which might download their elo.txt from stats.xonotic.org, even before the new player has joined the match.
This doesn't stall darkplaces (no 100ms max frame times), but it does cause existing players to stop moving and see the disconnected icon. The stall can occur even when A and AAAA records for stats.xonotic.org are cached locally.
This can be worked around with set g_playerstats_playerbasic_uri ""
which causes "N/A" to appear in the elo column of the scoreboard, for players who have found and enabled that feature.