[mythtv-users] Why does it take 20% cpu power to run mythfrontend when it used to take 4%?

[mark]

when running top, it is currently taking 20% cpu power on my AMD 2500 to play 
an MPEG4 recording at 544 x480, with most everything cpu intensive turned 
off.  In previous versions, from 0.10 to 0.13, it took about 4% cpu, with 
everything cpu intensive turned ON.  Has anyone else noticed this?  I used to 
think that an AMD 2500 was enough oats to record on one analog card and 
playback one stream, but now I'm not so sure anymore.  I get occasional 
skipping if the backend and frontend are both working at the same time.  I'm 
using anywhere from 50%-80% cpu to record in MPEG4, and the rest to playback.
When I first setup myth at 0.10, it took about 35% total to record and 
playback a stream at the same time.  What else could have been added to suck 
up this much processor?  anyone got any ideas?

In the event that I can't do anything about this, how feasible is it to roll 
my database back to 0.10-compliant?

Thanks,
Mark