I have this game on both steam and gog. I haven't had any problems for 2 weeks playing it on steam. I decided to go with a different antivirus. So I started playing the gog version because I had to clear the game with my antivirus to not lose my keyboard control in the game.

Playing this game using the steam version zero problems other than losing my keyboard control due to my antivirus.

Playing on the gog version. I was not able to place a artifact in the museum, and today my computer rebooted while playing the game. I have never experienced either one of the prior issues on the steam version. I don't play with mods or mess with the game files.

I'm going back to playing on the steam version. This post is just a notice to let gog know there's something going on with their version that's not happening in the steam version.

Sounds more like a problem with an overly aggressive antivirus setup. But if playing the Stream version is a successful workaround for you, then that's cool too.

I had issues with that exact same setup. I think the game gets confused when both versions were installed. I ended up removing the steam version and reinstalling the GOG version and it's been flawless since.

I've had problems with a newly built machine (win7 ultimate 64bit i3@5ghz 32gb ram SSD Nvidia1070@4kUHD) suddenly running this massively slowly either loading available saves or transitioning into the world.
It's like it needs more data throughput than my 32gigabytes worth of DDR4 and SSD hard drive based game location can serve it on it's basic information fetch quest.
:\ Boggles my mind, as what changed with the latest patch? Not at all much visibly, as they don't seem to have added anything; and if game speed was a bug they fixed give me the old version that use to run smoothly and flawlessly on an 8gb DD3 q6600@3ghz via a spinning rust drive :P