On the web frontend, we paginate the reports and so it is supposed to be responsive with large datasets. We tested this with around 10K rows, we'll surely scale-up our tests for this.
BTW which charting library are you using for your reports?
You mean the source? I am not in a position to post the source, it's a product I'm developing with one client (who has it running) and another prospective client.
We haven't had time to make a marketing/demo site for it yet, sales has been through networking so far.
Did you do anything to make it work with large datasets? Is the web-frontend still responsive if a query returns 1 million rows for example?