Odd video stuttering

[snowmoon]

I have a UBMP 2.4 15" and under my user I can't play back the 1080p trailers such as astroboy without stuttering. If I switch to the guest account they play fine.

I have deleted any quicktime prefs
I have deleted all ByHost prefs
I have run applejack to remove corrupted prefs
I have install and uninstalled perian
I have uninstalled flip4mac
I have renames .cshrc
I have removed all Login Items
I have removed all launch agents in my library
I have removed InputManagers
and I'm sure a few more that I've already forgotten about.

Both users show the same decoder, but the guest plays smooth and without difficulty what my users stutters to keep up with playback. Neither seems that different in terms of CPU and neither is getting anywhere near 100% CPU.

I'm going insane trying to figure out why this works for one user but not for the other.

 

[richard.mac]

see what apps are using a lot of CPU load in your account using Activity Monitor and quit them.

 

[snowmoon]

see what apps are using a lot of CPU load in your account using Activity Monitor and quit them.

Load is very low, no other apps are using CPU time. There is free memory as well.

 

[snowmoon]

OK, it's not my account. It's whoever is running the first copy of quicktime.

If I ( or any account ) runs quicktime it stutters/judders

If I run quicktime and leave it open and switch to another account it works fine in the second ( or third ) account by consuming twice the CPU.

WTF? I'm testing with the 1080p Trailer for AstroBoy since it's easy to spot.

 

[Jethryn Freyman]

I have this happen with Quicktime with some movies too, but not with HD movies, just average low quality .avi files.

Try VLC, it should play them fine.

 

[snowmoon]

I finally figured it out. It was a hardware issue.

Stuttering went away with the application of the SMC 1.2 update for the UMBP.

I couldn't believe it either.