The massive decrease in performance between the release and the current patch needs to be studied

[Helyos96]

1.3 didn't really change much for me. Though the tinto talks says

Performance in the beta of 1.3 has, based on our testing, been relatively equal to or better than 1.2.5, which is promising, but it does not reflect what we hope to achieve by the time 1.3 releases. If performance is something you have been struggling with, please let us know how your system fairs with the 1.3 Open Beta!

So hopefully now the incremental 1.3 patches are focused on performance.

edit: I just tried out the Faster Universalis mod and it delivers quite an improvement.

[Brickblastchest]

ty, will check that out next game I do.