Why does CS ALWAYS build histograms?

Ok, Adobe gurus. I have bragged to my co-worker that I always get quick, problem solving advice from this forum, so don't let me down.

The issue is that when my colleague does just about anything in CS (saving a file, flattening, dragging layers to other files, etc.) he gets a message that CS is building histograms. I don't experience this phenomenon on my computer, so we're wondering if it's a setting somewhere that we're unaware of.

We have G5s running under Panther with 4G ram.

Any ideas?

Thanks,
Tricia

check both your's and your coworker's "Memory & Image Chache" preference.

Both preferences are set the same way except I have my memory usage set to 75% and his is at 50% (this is a recent difference, and the problem was experienced before I changed mine as well).

Thanks so much for responding,
Tricia

He has the histogram palette showing.

But it sounds like something else is slowing it down -- that shouldn't be a huge time hit (certainly not enough to show a progress bar).