New Update Issue

Hi, apologies if a message came through on the google forum I'm unable to see if it successfully posted or not. I've installed the new 6.0.2 update and tried to track 10 flies in an arena using a 3 minute video and its been running for over 24 hours whereas previously it would only take max 1-2 hours. Just wondering if you know what the issue is here/what's happening? Thank you!