Mk 1 belt speed is 60 resources/minute, Mk 2 is 120, Mk 3 is 270, Mk 4 is 480, Mk 5 is 780.
1, 2, and 4 follow a standard pattern of doubling the speed of the previous upgrade (well 3 doesn't EXACTLY, but it does double what Mk 3 SHOULD be).
So my suggestion/request/feedback/whatever is to NORMALIZE/STANDARDIZE the upgrade speed for each tier.
At the current moment, Mk 3 belts transporting 270 resources SURPASES the output efficiency of Mk 2 miners by about 30/minute (on a pure node). Ideally, the Mk 3 belts should transport at 240/minute (which not only keeps it in sync with Mk 2 miners on a pure node, but also 200% overclock on a normal node). Furthermore this keeps the belts in an easy pattern that one can estimate ahead of time.
So to keep the pattern as DOUBLE the speed of the previous tier the belts should go as follows:
Mk 1 - 60, Mk 2 - 120, Mk 3 - 240, Mk 4 - 480, Mk 5 - 960, Mk 6 - 1,920 (and assuming we go up to say mk 10...) Mk 7 - 3,840, Mk 8 - 7,680, Mk 9 - 15,360, Mk 10 - 30,720.
In short....BELTS SHOULD NOT RANDOMLY GO FROM 120 -> 270 -> 480 -> 780 IT DOES NOT MATH RIGHT!!!!!!! (also it messes with my OCD hahaha)