I recently got mailed by our support department.

A customer using my program experienced performance issues after updating the whole system; attached is a video recorded by the customer clearly showing the difference.

I watched the video: the old version took 20 seconds to load. The new version 26. After querying the data, it's shown in a list.

The updated version showed 61 datasets instead of 6 in the old version.

I asked the supporter if he even watched the video and he answered: sure, and I'm able to see the performance issue!