I know exactly why the game slows down over time: Every time a mission is started, a new level is created. However, when the mission is over and the player returns to the menu, the level is NOT deleted and it lingers, which causes massive lag.
It's cool, but there are still a couple bugs. Some of the keyboard functions 'stick' and could throw you off the track instantly. Also, after driving a while, the car seems to 'forget' upgrades.
we're pretty sure the 'stick' is something happening with kong posting scores the background - other games have had this issue as well. i've never heard about the upgrade thing, i'll look into it - thanks : )
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just got done with a 7 hour drive, let me settle, ill look at this and the missile turn speed