With Mowzie's Mobs installed I was running into an issue where anytime I went to the end I would see the ender dragon and all endermen freeze up for long periods of time and not respond to any interaction. In fact any entity in the end would lag pretty seriously. I also noticed chunks themselves taking longer to load. Tested with only Mowzie's Mobs and Better End (Forge) and confirmed that it's these two that have issues together

Have you tested with Mowzie mobs alone? The update came out very recently, and its likely they can have some issue..i am telling you that because a problem like this was never reported before regarding BetterEnd..so first of its better to test if this is a problem with Mowzie Mobs

Just tested with just Mowzie's Mobs and the issue either is barely there which makes it hard to tell, or not there at all.

I posted the same thing on the Mowzie's Mobs repo and they said they suspect it's related to another issue their having. I just wanted to post it here just in case.

Yeah, i saw the post there, it seems the issue is only on their side..closing this for now. I'll reopen if it turns out BetterEnd is actually involved in this