What is the most optimized Speedrun in Hill Climb Racing? I know the 50m categories are all very optimized, but the other categories are able to be brought down by a bit probably. (Except Back Flip Mountain?) Or is there a category even more optimized than the 50m category?

Alot of the death% ones are almost at their current theoretical limit

For now at least

Can Backflip or Flip be done sub 1 seconds? I know sub 1.3 is.

If a death% time is under 5 seconds then it is likely that a neck flip time of under a second is possible

The fastest Neckflip is held by Fil0Nerd with 1.270 seconds on Countryside. The fastest Backflip is also 1.270 seconds on Mountain held by me. So the Question is, which is faster or do they have the same limit. In the Flip category the fastest Flip is 1.620 seconds on Moon also held by me (How?). The Question if Flip or Backflip is faster now arises, since the Flip on Moon is faster than the Backflip on Moon. To get back to the topic Death% seems very optimal to me as well as the 50m on some/most maps.

Different maps have different limits based off the inclines,typography,gravity,terrain,vehicle used and the vehicle's set up and sometimes there can be a very very small amount of luck as well