It is my opinion that sql should work. The last true stress test was several dozen people, and IIRC they were all in the same hex and someone selected a mission. Until that point in time, the server was doing OK, bit of a stutter, but ok. The stutter was do to the logging. I strongly urge the powers that be, to use the sql server kit when GW4 is live. There may be absolutely wrong with it. The problem experienced in the past may not be present during the course of normal play. I would use the sql kit, and not tell the player base...ala single blind experiment. If it crashes after a couple hours then restart with flatfile, but I do not think it will crash.