We're currently working to fix the performance bugs that we've seen pop up! Despite no updates being made to it in both version 1.1 and 1.2, we're working to fix the performance issues actively and should be included in a 1.3 version fix.
In the meantime, you can try limiting anything that might eat up CPU or system memory, like closing out of any opened browsers or recording software.
Thank you for reporting this, though! While we have known about the issue since release, it's good to know that other people have been experiencing the bug, making it known that it's something to do with lower end hardware, that way we can narrow down on how to fix the issue.
We hope you remain updated though, it's a shame you can't experience the game in its fullest! The issue is entirely on us, and as a result, will be fixed.
Thank you!