Something I'm noticing that a large amount of the time-gate in R2-R3 atm is that the overcharge reactor upgrades take forever... until you get this 1 specific warp upgrade, and then it goes from taking 3 days to taking 3 minutes.
I just want to draw attention to this, in case this is unintended? It seems to me it might be more desirable for the progress to be a little smoother (like splitting it into 4 1-point nodes, 2 of them in between the prior chain of max power/power gen upgrades, to space it out a bit more).