Incompatibility with higher than HD display or Windows 8.1?
Overall, I'm surprised at how slow Trados seems on this new laptop, considering it's high end CPU and SSD hardrive.
I've recently switched to Windows 8.1 on an i7 with SSD and Studio is running fast, very fast.
I think your display issues may be due to the QHD display, but I don't know what to suggest if you've already tried changing the setting to a non-native resolution. If you connect a 2nd monitor, does the Studio display and performance return to normal?