I think he means alt+tab into another application and back.
The last Q&A session they spoke about this. They’ve tested this on several pc’s but could not reproduce it. That’s why they told us that they will build more granular diagnostics to be able to see which module is the culprit. In the mean time they ask us to give as much information as we can. So indeed your pc specs, graphics card, driver version, peripherals, add-ons, flight plan, location, aircraft, location, weather type, etc.
I know, it’s tedious, but it’a not that they don’t want to fix it or give other things priority. It’s just that they can’t.
And I see that you add something interesting, panning in the cockpit. So could you add if the frames are okay when you look straight ahead from within the cockpit and also with external camera? Is it only when you look left or right? Are you running dx12? If so could you toggle to dx11?
You could use this topic in the bugs section to add your information to, to bundle all information.