Dhtmlx Spreadsheet Version 2.1 Become Very Slow

Hi,

We are using dhtmlx spreadsheet version 2.1 since a long time.
It works with database and we have a lot of sheets and thousands records in sheets.

Now problem is it takes too much time to load sheets and it misses data on save.
How we can improve our code so it work smooth?

Dhtmlx Spreadsheet Version 2.1 is the latest version which works with php?

Thanks

Dhtmlx Spreadsheet Version 2.1 is the latest version which works with php?

Yes, it is the latest version of the dhtmlxSpreadsheet with the php server-side approach.
If you have any specific problem with your application, pleas,e provide a complete demo or a demo link, where the problem can be reconstructed locally, so I can suggest a probable solution.