Find the physics line variable fInAirFallingCharGravityMult .
When you install the Flying Mod (via its P1FlyingRing plugin), you gain access to a surprisingly robust flight system. p1flyingring
Fast flying causes trees and grass to pop into existence abruptly. This is an engine draw-distance limit, not a mod bug. To mitigate this, adjust your uGridsToLoad settings inside your Skyrim.ini file. Find the physics line variable fInAirFallingCharGravityMult