I have 17 tracks. 3 midi tracks, the rest audio. One of the midi tracks is Dimension Pro with a string section selected. 2 instances of Z3TA+ 2. Guitar Rig 5, Izotope Nectar, Izotope Alloy 2 for the plugins. It is about 4:45 minutes long. Sampling rate of 44100.
I have used all of the above, with the exception of Dimension Pro maybe, at various times in FL Studio 10 and never noticed it being as slow as Sonar 2 at any time. Have seen the CPU get really high during playback because of plugins but it never loaded this slow.
Thanks for your replies. Guess it is something I'll have to live with.