Fast GUI in big projects

Cant work in big project because of Sllllloooowwww gui. I’m pushing mixer button & mixer open up after 1-2 seconds, when i zoom in/out i have feelings my C9 will crash…
Working with audio tracks more then 50, zoom in/out… oh… nightmare!

in C5 GUI was perfect, yes looks like old win98, but it was soo fast & smooth! Other’s DAW doesn’t have problems like this, or they fixed long time ago.

Gui in Cubase (since 7) start be slow and slow with every new version (I’m afraid thinking what happened in C10), really get annoying.