Hi Zionner,
at the moment you can export your fractal terrain, your place of interest with Heightfield by shader node to a .ter-file
Loading this calculated Ter is much faster than letting your computer do everything each render.
But it does not save overhangs or other lateral displacements - yet.
The Heightfield by shader takes some time (get a coffee for a 1024², go shopping for a 2048² and get a good book for a 4096² resolution) and it may take longer to calulate the entire terrain when the displacements are considered, too.
But when thinking of an animation, every second counts. And if my idea is faster, I would love it :-)