I am currently running Analog Lab 1.1 on an evaluation licence prior to (hopefully ) buying KeyLab49, but I am encountering some strange behaviour regarding high CPU usage when running the VST3 in Cubase 7.0.
My system is running on a Windows 7 PC, with quad core Intel i7 (8 core hyper-threading), and 6 Gbyte RAM.
If I load the Analog Lab VST3 into Cubase, even with no project open, the CPU load immediately goes up to 20%. Hitting a few keys sends this to 100% and the sound starts to cut out.
Analog Lab runs fine as standalone, with moderate (<20%) CPU loading even with many notes playing, so no problem there.
I loaded the VST2.4 into Abelton Live, and no problems there either.
I then tried other VST3s in Cubase. Steinberg VST3s all run with zero CPU until a note is played, as one might expect. Tried with Arturia CS80 and that exhibits same high CPU as for Analog Lab ?!?
Just to see the extent of the issue, I then ran Cubase as another user on the same PC as above, and again loaded the Analog Lab VST3. I was amazed to see that on this instance the CPU loading was way lower and in my view, quite acceptable.
Is there any known issue regarding Aurturia VST3s begin incompatible with any third party applications that might be running in the background, e.g. anti-virus? I'm hoping someone here will have an answer as otherwise it will take a load of trial and error to identify and eliminate the cause of this problem. Also, why should Arturia's VST implementations behave this way when Steinberg's do not?