C9.5: Key Editor GUI very sluggish

C9.5: Key Editor GUI super sluggish

The Key Editor GUI is really sluggish here. And when I try to manipulate or edit CC curves (i.e CC1 or CC1 curves) it becomes even worse. To a point I see a timer cursor appear, and sometimes leads to Cubase crash.

Strangely, the Project Windows GUI is super fast.

Any ideas ?

No issues here. Do you have the latest drivers for your GPU? If you’re using the onboard GPU, you can download the latest drivers for it here:
https://downloadcenter.intel.com/product/81496/Intel-HD-Graphics-4600

One thing I may had. After an episode of sluggishness, when Cubase crash I get this error in the event log:

Faulting application name: Cubase9.5.exe, version: 9.5.0.55, time stamp: 0x59e6a397
Faulting module name: ntdll.dll, version: 10.0.16299.64, time stamp: 0x493793ea
Exception code: 0xc0000374
Fault offset: 0x00000000000f87bb
Faulting process id: 0x1cd4
Faulting application start time: 0x01d36c6dfc7a24fa
Faulting application path: C:\Program Files\Steinberg\Cubase 9.5\Cubase9.5.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: c4d1f3db-de36-415a-b303-60338975a173
Faulting package full name:
Faulting package-relative application ID:

Any clue ?

Yes, latest nVidia drivers