I have very long latency and very slow reaction
when playing on my Keyboard Roland A-49
and for example using Halion,
Very annoing it´´s impossible to play
Push the constrain delay compensation button…does this help?
If it does then the problem is you have plugins with high latency in the project.
What system are you using?
Any VSTs installed other than your instrument?
seems I had too many tracks ongoing, too old and too many changes
at that projekt