We never used to track race entries but we did track laps, so races =0 until you start racing on the new system. There must be 4 cars in race for the race stats to start tracking - but laps & yellows are always tracked (except on Bump & Jump)
CPU usage is nothing to do with me really so I dont know what to suggest there.
We've got a small problem with square/near square avatar uploading I think, I plan to fix it but the priority is low. It might get done today. For now resizing your image first should fix it.