Whoever told me about the ggpk editor did God's work.
return 0; in bloom, orb, shadows and distortion hlsl shaders.
Free memory after every client-side action related to monsters after a short delay (not DisableRendering(), but Delete() & Free())
Gtx 1080ti - 2k resolution (90fps normally, 60fps in the middle of abyss, 1.8Gb VRAM max, 4Gb RAM max)