Before contacting support - please check the amount of groups you are part of.
If you have hundreds of group memberships - this will overwhelm the ability of the app to cache your data due to its massive size.
We've encountered one person with this issue - who was a member of 500 groups.
The vast majority of these are unused.
You can speed up the app considerably by deleting a lot of the unnecessary group.s
Alternatively, contact support and we will be able to turn caching off for you so that searches go quicker.