VMS10 and AVCHD preview

LR2003 wrote on 6/20/2010, 3:43 AM
How does the AVCHD preview on VMS10 work?
I have found that usually the first time that I playback a clip on the timeline it will playback very slow(<10fps), but if I immediately replay the same clip it will playback at the proper speed(29.97 fps).

Also, sometimes a new clip or part of a longer clip will playback at full speed and sometimes very slow.

this seems a bit strange to me, So how does playback work?