Right after the map loads, before the countdown hit the "start button" to bring up the list of everybody in the room, if you have 4 GREEN bars light up before everyone else, you are the Host.
To get Host alot you will need at least a;
Originally posted by another user
Download Speed: 2221 kbps (277.6 KB/sec transfer rate)
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Sometimes it takes a few games to gain host, especially in Ground War, but you can tell when the old host leaves the room when everybody score resets to 0 before the next round.
My download speed is insane, but the upload speed... not so much Download Speed: 57489 kbps (7186.1 KB/sec transfer rate)
Upload Speed: 2064 kbps (258 KB/sec transfer rate)