Photoshop :: Batching Files Runs MUCh Slower

On my old computer, which was a 2.8Gzh Pentium, older model toshiba, photoshop ran really slow, there wwere "lags" when i would click around in a big image. Not bad, but there.

My new computer screams when editing photos... it's a 3.4ghz with a gig of ram, 7200rpm drive etc.

Yet for some reason, batching files runs MUCh slower on the new machine. I've tried to figure out why but can't see anything. Same batch from the same action too. All I'm doing is this:

"Generate proofs" action"

open raw file

fit image to 450

create text later

write "proof"

change opacity to 45%

flatten

save

That's it. But ANY batch I do will run slow like this, not just this one. It's driving me crazy cuz just to batch proofs of about 40 images (about what I shoot for a given photo session) takes like 45min!