Serious speed issue

[Mike B]

I have a one-time utility that needs to create 2500 zip files. Each file has a tif in it + a text file. The tif's are about 20MB each.

Using windows xp, right clicking on the two files and sending to 'compressed (zipped) folder' takes about 3 seconds or so to create the zip.

Using VCLZIP Pro (demo) it takes about 3 miuntes per zip .

Both compressions are max. Packlevel is 9 in vclzip which achieves the same compression rate as windows utility is achieveing.

Why? And is it possible to speed it up?

[Kevin]

Mike,

Sorry, I was out of town and just got back.

Offhand I'm not sure. Did you compile the demo with any range checking, integer overflow checking, or anything like that turned on? That will slow things down a ton.

Also, which version of Delphi are you working with?

And lastly, if you would like to send me a compressed version of one of those tif files, I'd be glad to play around and see if I can find out what's going on. It's always possible that for some reason, zlib is not fast at compressing gifs, but I'd like to see that to know for sure.

Kevin