Using the glitch used here:
in this map

Time used to:
- Build the end portal
- Grabbing 'Return to Hub' command block for faster flight in the end

will not be counted in the In-game timer, thus making it faster. Obviously, it is slower RTA though.

Which is why I'm making this post because I'm not sure if the mods will allow it because technically this glitch is just exploiting how the timer works.