when I run 15 Styluses in Cubase6 & Cubase7
obviously ,the Cubase7’s performance had crashed but Cubase6 ran well
the most interesting thing is , at that time the CPU usage was below 25% !!!
how could Cubase 7 so weak???
My PC SYSTEM:
OS:Win7 64bit
cpu:intel core-i7
ram:16GB
How do you know this?
There are settings in Cubase 7 not available in Cubase 6. The OP has not indicated that these settings are being used.
Also, is this on a PC or MAC? Do you know this? Performance has varied across platforms, it would be good to know how this translates in this situation.