I’d guess the max download rate from the server is capped at 25000. What you need to do is set up http re-direction, so that the maps are downloaded off a web/ftp server. This may well be the same machine as the game server but different settings are required, and, of course, you need a web/ftp server running to accept the requests.
Assuming you have a web/ftp server, the settings you’d need to adjust are:-
set sv_wwwDownload “1” // set to 1 to allow downloads via web server.
set sv_wwwDlDisconnected “0” // Disconnects players from game server whilst downloading if set to 1.
set sv_wwwBaseURL “http://www.yoursite.com” // e.g. “http://www.yoursite.com” if .pk3 files at yoursite.com/etmain/
set sv_wwwFallbackURL “http://www.yoursite.com” // Make same as BaseURL setting if no alt web location for files??
Obviously replacing www.yoursite.com with whatever URL your web server uses.
Note:
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The maps need to go into a folder called etmain, which must NOT be included in the URL (ET appends it).
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The .pk3 files on the web server must be identical to the .pk3 files on the game server, or else weird shit happens.