I’m currently feeling it now. Went Karting with work last night to F1K in Newcastle. Being an indoor arena I didn’t hold out much hope: My experience of indoor tracks are usually narrow with under performing karts. This is different. The track width is about the same as that as an outdoor track, and while it is shorter than an outdoor track the karts are quick. If you are good you will be able to get under 30 sec per lap (I managed 30.8).
Final result: 2nd place and I had lapped everyone except the eventual winner who lapped me. Twice.