for 1s+10.5, it will be quite slow, but good for beginners.
when you are more advanced, you can speed up 1s + 10.5 in 2 ways:
1) gear very high, maybe use pinion 40, spur 88 to get high rollout ~ 65mm
or
2) use a turbo esc to get more speed.
hehe, i am still learning the setup from others.
once you get some practice, you will find 12s very fast, but with control. and you will jump to 4.0r in a short while.