I recently upgraded from cubase 7.5 to cubase 8.5 i am happy with the audio performance but the GUI is really slow and laggy. Zooming and Scrolling is lagging like crazy. The more tracks are visible the more it lags. I even upgraded the graphics card but the issue is still present. At this point cubase is almost unusable at my work.
Mac Pro with El Capitan 10.11.3 (15D21)
Processor: 2 x 2,66 GHz Quad-Core Intel Xeon
Memory: 16 GB 667 MHz DDR2 FB-DIMM
Graphics: AMD Radeon HD 7870 2048 MB
Interface: Waves DiGiGrid MGO
Is this a known issue or can anyone help me to fix this ?