I haven't really had time to follow this hack in quite some time, so I'm not sure if someone has mentioned this before... If anyone is still having an issue with the amount of time it takes to load the main arcade page when there are a lot of games, I've found a pretty simple fix for that problem. If you log into phpMyAdmin and run the following two queries it will help improve the speed dramatically...
ALTER TABLE `arcadescores` ADD INDEX ( `game` )
ALTER TABLE `arcadescores` ADD INDEX ( `username` )
That doesn't help with the number of queries on that page, but it does help a lot with the page generation times. Before my page took around 2.5 - 3 seconds to load (with about 15 games), but now it's down to about 0.5 seconds.