but I was advised to post here as well to see if there are similar experiences.
https://www.virtualbox.org/ticket/18874
My environment:
Host OS: Windows 10 64bit
Guest OS: Debian GNU/Linux 64-bit.
Linux 4.19.0-5-amd64 #1 SMP Debian 4.19.37-6 (2019-07-18) x86_64
Memory: 16 GB memory is assigned to VBox out of 32GB real memory. CPU:
Ryzen 2700, 6 out of 16 (8 real core + 8 hyper-thread) are assigned to the VBox guest.
Real Display used: 3840x2160 (60Hz) Dell
Real Display Adaptor on the host: NVidia GeForce GT 1030
Background and Symptom:
I am using VBox under Windows 10 host on a few PC's. I have used VBox for at least several years now.
On a home PC, I switched from 5.2 series to the latest 6.0.10 about a couple of weeks ago, and experienced a visible slowdown of X11 drawing inside the guest Linux. (Say, when I move terminal windows around the screen. The move is not smooth and very jaggy).
Fast operation with VBox 5.2 series
The slowdown is so much so that I switched back to the 5.2.32 VBox today, and verified that the moving of terminal window inside the Linux guest that runs inside 5.2.32 VBox is fast and much smoother. With 6.0.10 VBox, moving windows shows the wiggling of window frame if you know what I mean.
I have uploaded relevant log files and x11perf benchmarks that show X11 under linux inside VBox 6.0.10 is about 480 times slower when it comes to scrolling and copying of rectangles
Any comment or serious bug hunting will be appreciated here and the bug tracker
https://www.virtualbox.org/ticket/18874
TIA