Also, it's not just look ahead plug ins, like the concrete limiter, for example. CPU intensive processes, like a convolution reverb, will cause this delay.
In Sonar the biggest culprits are Perfect Space, the PC Concrete Limiter, LP-64 EQ and LP-64 Multiband Compressor.
As I mentioned above, just track without them, and disable them individually if you need to overdub.
@mickb66 - Glad you got the latency sorted. I'm not sure what you mean - "the drum track I tried to move it to track one and now I have no sound on playback from my Instrument track.."
Did you use Simple Instrument track for the drums? How did you move the track?
PM me if you need any more help.