Cakewalk and Sonar Platinum have a problem for scrolling speed.
If a MIDI track had a lot of control data, the speed of scrolling & shortcut keys & drawing & whole operatings become slower.
I test it many times in Cakewalk Bandilab and several Sonar versions, with Intel 8700K GPU and NVIDIA GTX1060 VGA.
I attach its video.
http://www.midist.pe.kr/temp/scroll.avi PS. There is no this problem in Sonar X3.
I just found that this issue happens in Win10 Redstone(Latest Version). There are no problems in previous Win10 versions. In Win10, the whole operatings become slwoer upto not work anymore. I cannot even use shortcut keys and draw control data.
It's very serious...