Gliders can do all sorts of things with even minor lags. The bonus effects you can get are quite humorous (at least for me) and add a degree of irregularity.
If you get it right, you can get an upwards thrust which can make you shoot into the air (sometimes over 10 nodes!), helping you to climb stuff.
Maybe you jump off a cliff and try deploying your glider only to fall to your death because the glider didn't open in time, or it disabled itself somehow.
Or you can even deploy your glider while on the ground (which normally shouldn't work) and start jumping around while experiencing the awesome physics of the glider - eventually this won't work anymore, but it has lasted quite a while sometimes (upwards of 30 seconds!), with a moderate amount of lag!
Or maybe you rubberband(?) - falling down from a cliff slowly and surely, only to find yourself shooting into the sky and your glider suddenly disabled!
In general though, >80% of the time the glider works great for me, and I live in a really heavy game :-) Most users of this mod will likely never run into these issues. If you need to survive a fall down a cavern or just like gliding off of towers for the thrill, this mod is for you! Recommended.