troubleshooting: re-position cursor - Delay?

When i re-position the cursor by clicking on the timeline, there is a significant delay (eg. 2 sec) before the cursor moves.

Is this normal?

My disk and cpu performance is at 10% (ie. not overloaded).

My buffer is 128.

Rewind, forward, play etc, work instantly.

Anyway, note, the delay is before the cursor moves. not between pressing play, and playback beginning.

Has anyone experienced this?

Any fix or workaround?