When you double click a job? You have the newest installation of thrive (ONYX_Thrive_19_0_3_GM2.exe)?
You have SSDs and no spinners? Opening the job from local disk? Turn of any additional antivirus to see if it's checking it.
Ours isn't blazing fast, but we are using 5+ year old Dell Inspirons on a 10/100 network, and often working with multi-gig files. If you've got modern hardware I'd check for other conflicts or resource stealing applications, then maybe consider a fresh format and reinstall of just the required programs to be sure it's not related to other software.
Holy smokes no SSDs on a brand new machine? That's is the worst choice ever.
Try to open a very small job / picture and see if that is faster or not. Also try that from a external source like a usb stick or a disk.