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Adam, have you considered putting the source code for this on GitHub so people can contribute by fixing issues and adding new games? :-)
Post edited July 20, 2021 by bteg
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heather1348: The game runs well except for some audio sync issues in cut scenes - this is a known problem and I haven't heard of a solution.
There's a Proton variant containing a workaround: links at https://www.gog.com/forum/horizon_zero_dawn_complete_edition/two_questions/post5

If you don't want to use that then you can try these, but they involve stuff like disabling the CPU governor:

https://github.com/ValveSoftware/Proton/issues/4125#issuecomment-798826896
https://github.com/ValveSoftware/Proton/issues/4125#issuecomment-799024764
https://github.com/ValveSoftware/Proton/issues/4125#issuecomment-831095193