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To be honest benchmark will not help you much unless you have your own dedicated server. If you have your own server I would suggest using munin or any other lower level monitoring tools to monitor your HD, CPU and RAM usage. Munin has good plugins too.

I have seen and (experienced myself) players being in an coneection interrupt state for a long time from time to time. Never consistently and it doesn't usually affect every player the same way. Having red bars with an external tool does suggest it is stuck on something or the connection is getting refused for a while. I don't think there is anything programmatic with the database handling that can take so long. Handling the records at the end game does actually less than !usersearch command. Unless the command "/rcon dboptimize" is given. That one should perform exponentially worse when the database grows. But it also needs to be triggered with an rcon command every time. I can think of three areas where to look further, some sort of issues with file system when actually writing the data to a file, networking/firewall issue, or, game is for some reason resending the game state to player(s) for a while. The last one is what I have seen happen a few times, but I don't know what triggers it. Gamestate is automatically resent if the server thinks the player is still in the previous map. It could be caused by the mod somehow.

If that fixed the issue then it seems like HD I/O issue on your server. Try this command on u Linux shell and dd if=/dev/zero of=test bs=64k count=16k conv=fdatasyncAnd post the output here. It might give an idea if something is wrong with hard drives.

If it is one of the maps the only thing you can do is go through them one at a time adding them until you get the problem and then not use it or try to get it fixed.