It appears the original Ultimate Belts mod is not updated to 2.0 yet. In the meantime, can you add compatibility with an updated version for space age?

https://mods.factorio.com/mod/UltimateBeltsSpaceAge

does it not work for you already? It seems to work on my end just fine.

edit: so I do see that the animations don't appear to be working. But the original author of the mod stated that above the original top speed belt, the animation were already wonky / not working at all. This mod doubles the belt speed starting at the lowest tier. which means the highest tier belt in this mod, moves items at roughly 3840 items per second. Which is much higher than ever intended. So while the belts DO work, they just won't display properly.

The problem is that the original ultimate belts mod is still for 1.1 and can't even be enabled for 2.0 and space age. I have not tried enabling the mod I linked (Ultimate Belts Space Age) and this mod so I don't know if it just simply works. I was still waiting on some mods to update to 2.0 and have not actually played any space age or 2.0 just yet. I'm not worried about the animations, it certainly makes sense they would be too fast to properly render.

I thought you were trying to tell me that it wasn't working. I set everything up to start working on the issue just to see that it seems to work as well as can be expected. In the future, please make sure what you are asking for is necessary in the first place! Doesn't really bother me, but I can think of a few creators on here that would be pissed off about it.

Please, install the mods and see how they run for you, let me know how it works on your end. I'm curious about the animations. It could always be a problem on my end as I only have one test environment.

You are correct, I apologize for wasting your time.

My thought was it would not inherently work since they are different mods - Ultimate Belts (the original mod title) vs Ultimate Belts Space Age. It baffles me that it just works. I should have booted it up before asking a stupid question.

I checked the animations. None of the ultimate belts move at all, but items still zip across them at light speed. The new green belt animation from vanilla Factorio works fine with this mod.

Again I apologize, I was wrong, I hope you still have a good day after dealing with this and me.

I suppose my day wasn't entirely ruined... :) No worries, friend. Hope I didn't come across dick-ish. Was just sharing some wisdom with you because I'm done the same elsewhere and had my head bitten off. lol. Let me know if there's anything else I can help with. :)