Hi Alex.

If you're on a subscription with us, I'd recommend using the latest version of our software which is v27.  You can find out how to download and install this here.

In terms of your issue, does this occur for all users and machines on your network?

The first thing to try would be to take a back up of your data, then run the Reindex and Compress options from inside the Recovery Tools window.  Find out how >.

This can help improve the performance of your data but if this doesn't help, we have a great guide to troubleshoot performance issues.  Find out more >.

I hope this helps!
Adam
Sage UKI