Please email supportdos2@larian.com with your save (or a Dropbox or Google drive link, etc), and I can probably remove the slow status in the developer build of the game. I can also confirm if the issue is fixed in the latest build for the next update (it should be).
If you are using any non-Larian mods, also include a list of those enabled and/or the modsettings.lsx file from your profile folder.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2 Definitive Edition\PlayerProfiles\<ProfileName>\Savegames\Story' folder.
In Windows Explorer you can zip a file or folder by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder' (and similarly in OSX/Finder).
