I am usually running over 30 mods (8-9 GB memory footprint) at time and I can confirm that graphicslib is the cause of my crashes when saving and save copy doesn't help and has the same results. Every time the crash occurs at saving stage 2.
So the only way, this thing does not crash my game with all the mods enabled, is when shaders are set to false. Unfortunately there is no way to not use this enhancement, as many mods have it listed as requirement.
I would like to know if the author can, or is even willing to do something about it. I really like this lib, but unfortunately the only way to run it safely, is to run it deactivated.