I removed shadows implementation because moving light center caused shadow crawling which is hard to get rid of with small cost. It was possible to remove but it was droppingg about 120FPS(fom 340 to ~200). I have reduced VRAM usage by reducing water buffer size. With render distance 32 game use 1.6GB of VRAM and 700MB of RAM. Rendering is GPU optimized(80%+ usage, <20% CPU usage. Video might not looks like 300FPS because of video compression.