If you can give us more info about your APP we can narrow the problem source.
- How many rows are you using?
- How many Tabs do you have? How many columns have you created?, etc.
Sometimes a good design helps any APP’s performance. For example: not always a Brute-force search is enough, if you can create an index field in your database/table, the performance will increase a lot with low effort.
Is the amount of pictures suspected (or the size)? Create a copy of your APP using now the same image link to everything and test the performance again. This will discard or not any problem associated to the imagine links as your 1st step to fix the issue.