[mythtv-users] delay at jumping forward when watching pvr-250 recorded shows

[tv.mania]

Hi,

Jumping forward for 10 minutes takes 50 seconds and jumping forward for 
10 seconds takes 2 seconds, when watching recorded shows.
This only happens on those recorded by pvr-250. Those recorded by 
software cards does not have this problem. Backward jumping does not 
delay. Foward jumping in previous backward jumping time range does not 
delay either. Watching recodings when they are still recording does not 
has this delay either.  If I delete all recorded program and clear 
records in mysql, this delay disapear. However, when recordings 
accummulate a lot, it starts to happen.

Why and how to solve this?

Thanks,
Andy