You might have this:
https://bugs.mojang.com/browse/MC-36883
with a better breakdown of it here: http://forums.teamextrememc.com/index.php?/topic/22158-about-chunk-ticking-client-lag/
In essence it's a vanilla game bug if that's what you're seeing and for me anyway, it makes any 1.7.x world unplayable pretty much so my options are either modded 1.6.4 or vanilla 1.8 for now (it was fixed in snapshots leading up to 1.8).
I don't know if that's the issue you're having though it certainly sounds like it cause it's in essence unreleased chunks starting pretty much at any falling water point, which eventually leads to complete stall the further away you get from the problematic chunk and the more unreleased chunks you accumulate (normally chunks are not updated anymore once you move away from them so you should never be really above 10-15 chunk updates unless you're rapidly moving and loading new chunks). So, read the links, and if it sounds like what you're seeing, I'd say go back to 1.6.4 version of that modpack and see if you're having same lag issues.
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Man, i miss this mod soo much. I cant wait for it in 1.12.2. Its sooo freaking good. Best world gen. 10/10.
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Thanks a lot!
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Becausr it is easy(i)er to see what mod if crashing the Minecraft. When i am at the PC again, i post some screenshots. Sugestion, more stairs, slabs, bricks, glass(obsidian glass?) BOWs, crossbows would be good too.
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