Hello Pieter,
I cannot remember, it was more than 2 years ago.
Before trying the FNC TableView, we had tried using FMX, and the scrolling was also incredibly jarry and slow on both iOS and Android.
We have since bitten the bullet and redone both apps natively (the Android App using Android studio, and the iOS app using Swift and XCode) and the result is now fluid and fast.
My conclusion is that Delphi is great for the Windows desktop and C/S (and this is how I have been using it since 1995), but that for phone apps, it is just too heavy with intermediary baggage.
Very best regards,
Olivier