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If the game is clunky (windows 10 64bit) ive changed in the options renderig from hardware to software and it is now running smooth. Maybe it will help someone.
Software ran very poor for me so I created my own solution.

https://www.gog.com/forum/divinity_series/divine_divinity_smooth_fps_using_dgvoodoo_2_guide
Changing to software mode fixed the problem for me too. For anyone wondering where to find this setting, go into the games install folder, then open "configtool".