We've identified an issue with our latest tablet POS update that has slowed down performance for Greenline users. Our engineering team has identified a fix and will be working on release this week, based on Android/iOS app approval times.
EDIT 1: Apple is currently reviewing our expedited app submission. We will release the fix as soon as it's ready.
EDIT 2: The performance update has been released. Please go to your app store to update your apps.