UI Performance Degradation on Android with Unity 2018.2.20

Hi all. I've been looking into possibly upgrading to 2018.2.20 from 2018.1.4 for the current project I'm working on and I discovered that there appears to be a pretty bad performance degradation in the UI on our min-spec Android device (Samsung Galaxy S4). The Layout method appears to have increased in time from an average time of 0.5ms to 7.32ms! The UI tab (Section? Bar?) in the Profiler also shows this increase:

2018.1.4



2018.2.20



Worth mentioning the code and data is identical for both captures. Has anyone here noticed anything like this? Would love to hear the thoughts from someone at Unity.

This issue is significant enough for us not wanting to make the upgrade.