there are a couple of ways:
1) if you make a copy of the App and go to the script, you'll find in the first section (called Initialize) a parameter that specifies how many months of data have to be loaded in the application. Make some tests, trying to reduce the amount of months.
Please be aware to make a backup of the qvd before doing that, otherwise they will be overwritten with less data.
2) make filters before trying to load the sheet
Hope this helps