Possible Fixes

Yes

Modpack Version

1.1.0

What happened?

Video of the bug: https://www.youtube.com/watch?v=C2QOX1zKiIE
As you can see, every time I press left click on my mouse, the game freezes. Holding left mouse down only makes the stuttering/freezing worse.
The only mod I remember installing other than the modpack is Distant Horizons.

latest.log

https://gist.github.com/Max-Pare/8218daddb714f6f5903ac79965ac13a9