Linux Ubuntu 18.04 - Sculpting performance (dyntopo) is terrible in comparison to Windows OS: Ubuntu 18.04
CPU: i5-6600K
GPU: GTX 970
RAM: 32 GB

Sculpting on objects with more 100k polygons (dyntopo constant detail 50 px) lags blender, especially using Snake Hook brush and dragging freezes Blender. 

For comparison - on Win10 I can handle 1.5m polygons with Snake Hook with similar performance.

I have Nvidia 396, Cuda and most likely other Nvidia stuff installed too.
I tried Blender 2.77, 2.79 from archive, from synaptic, on steam and 2.8 as well, all of them have the same terrible performance.

Since I was moving from Win to Ubuntu, I used Win startup.blend file so I have most of in-blender optimizations activated, Cuda, backface culling included.

Is this a normal occurrence and I should stay on Win10 or is there something wrong with my Ubuntu?
This is not normal. The entire Blender Animation Studio is running Linux, with many machines using NVidia GPUs. All the Open Movies were made on Linux.