Hi, Writing to -factory since I'm really grasping at straws trying to narrow down what broken in my setup. I have an-up-to date TW setup with a Lenovo P52 (Intel Core i7-8850, Quadro P2000 Mobile/ UHD Graphics 630 ) and an external monitor connected over USB-C (Philips 346B1C) . This was working fine today, and last thing I did was run a zypper dup to upgrade to 20210321 and rebooted. I noticed two things being out of place: - the 'welcome' application popped up - performance was _very_ slow, as in the UI reacting to clicks, hovers, etc 1-2 seconds later. I narrowed it down to the laptop's internal display being turned off. Any form of mirroring/display joining gives me good performance(*), but using only the external display is horrible. I rolled back to a previous snapshot but that did not help at all. Does anyone have any idea about where I could look? Thanks, Robert [*] I can't drive my main display at 100Hz since the laptop display is at 60Hz, so good - not great.