I can add here that most of the time in many songs I don't suffer from this. However, in some songs at certain times — like when system processes are scheduled to run, typically beyond user control — this problem will destroy a session until I freeze some tracks. The next day it works with tracks unfrozen and adding more tracks and oversampled plug-ins is possible without as much as a sigh. There could be other reasons operation is disturbed too, but I've observed this now many times. Naturally other resource intensive application disturb just as much, including network operation. I've taken some steps in controlling other apps, but system processes are much harder to control than I thought and I'm a Mac user since years.One major issue that people have, including myself, is that other system processes disturb Live operation. I kindly suggest that you add functionality to optionally turn off or limit other processes, including system initiated processes. Starting Live with this option active should render the computer a 100% music machine with no other processes disturbing optimal operation, until you quit the application.
My own main problems are with daemons in OS X, specifically SyncServer related processes that at times can take maybe 80-90% of the 200% I have available on my Core2Duo, one of the machines with Live that I use (My main partner has a quad). Even when I have a faster processor, if I add up resources I will potentially run into this problem at some point. How can I perform under such dire circumstances? Even a little glitch during a performance, because of this, is one too much.
I do blame Apple in this case — I expect Windows 10 could be even worse — for not giving the user more control, but when you purchase Live you typically want to make your computer a music machine. Please assist us that wants to accomplish this objective.
Please vote to make our machines dedicated music machines. I'm open for all solutions including creating our own on both major platforms too, but I think it would be better if Live could help us control this when using it, especially for when performing with Live 9 in the mix.