The QMC is slow everywhere, but not all the time. Right now it doesn't even show the content on the documents tab, it's just a blank page that never loads. Maybe in 10 mins it'll work fine, but then again randomly it starts working slow or not loading at all.
The users are reporting bad performance in the apps since the update, taking too much time to load or not loading at all.
Facundo, I would focus upon your storage in this case I believe, where do you have everything saving to:
QVS User Documents
QVS Root Folder
QDS Source Documents
QDS Application Data Folder
If those are all on the same share/drive/partition, it may be having trouble keeping up with things at this point. You can use the Windows Resource Monitor and the Disk Utility and the Disk Response column there to check response times on the share, need to run that from the server that is providing the file services, and you want those response times to be around 5 ms or less in order for everything to run efficiently.
If you can provide further information about your architecture, what services are running on which servers and where things are being stored, can likely give a little more detailed direction at that point, but this may be enough to get you pointed in the right direction.
Here is one Support Article that may be of use too: Slow QMC
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