as we all know, it is only possible to notify the host(setParameterNotifyingHost) about MIDI controller parameter changes within the message thread. I created an additional thread with a queue that sends the parameter changes to the host (http://www.juce.com/forum/topic/problem-automation-live?page=1). This works pretty well in almost every host and there is nearly no delay.
Only ableton live 9 OSX seems to have a problem with the notify host messages from the message thread in the arrangement view. It takes much time until ableton gets notified about a parameter change and its not possible to make a smooth automation at all. In the session view it works pretty well.
I also tried to reduce the thread sleep time and removed the lock. Still the same slow notification in ableton live 9.
Does anyone know something about this or has an idea where the problem could be?