When i was using Katalon 7.1.2, duration of our tests was about 6h:
After i upgraded Katalon to version 7.6.6 tests slowed down to about 11h:
It took us some time to find out that it was Katalon version issue, but we finally did and after downgrade to 7.1.2 our tests got back to normal:
Tests was run on Katalon RunEngine as part of our CI system.
Please, verify the issue.