Slow screen refresh in Windows

[Cubist at aol.com]

sez tjframe at gmail.com:
> Try using a JPEG, they are much smaller - that same routine runs in 91
>milliseconds when using a JPEG set at quality level 10 in Photoshop (which
>is nearly loseless). In fact for on-screen use you can save a JPEG down
>to about 5 in Photoshop without any serious degradation in quality.
   Maybe. It *strongly* depends on exactly what's *in* the image you're 
working with. You should always have the "Preview" checkbox checked when you save 
an image as JPEG, so you can see for yourself how badly your image gets 
distorted as you reduce the quality level.
   In addition, you might want to consider Photoshop's Save As Web function, 
which gives you fine-grained control over various adjustments, lets you reduce 
the filesize down to pretty much any arbitrary figure, and also lets you 
compare the untouched image to 1-3 different versions with different sets of 
adjustments. Me, I use Save As Web religiously for all the graphics in my 
fantasy-and-science-fiction webzines TSAT (http://tsat.transform.to or 
http://tsat.xepher.net) and ANTHRO (http://anthrozine.com).