I mentioned this in another thread but I was asked to start a new one:
I have just started using Collabora Office in Android (v23.05.5.2 loaded from the Play Store). I have installed it on my phone (a Sony Xperia X2 Compact with Android 10) and an Alldocube tablet (Android 13). Text documents seem to work reasonably well but spreadsheets are very, very laggy.
With text documents, if the document is fairly long, scrolling through it is smooth enough but the text seems to be loaded in blocks. When the scrolling comes to the end of a block of text, the pages continue to scroll but they are empty. If the scrolling is paused for a while the new text appears and fills the empty pages but it can take a few seconds.
With spreadsheets, when I open the document it takes a while before I can do anything. Then if I start scrolling through the spreadsheet (even a smallish one), it works for a short time and then freezes. After a few seconds it then jumps to where it should be and works for another short time. It looks like some kind of buffering problem and if I get too far ahead of it the whole phone freezes and I have to turn the phone off and on again to get control. This happens on all spreadsheets I have tried.
There was a similar post about two years ago but no solution or follow up: