Just curious about the cause and if there is a way to speed it up. I'm running MAMP, so I configured a site in DW CS5 to "Connect using: Local/Network" and pointed it to a folder on my computer. There are about 1800 files to sync, I run transformations and minor edits on a select few of those files, and infrequently touch all of them. When I click the synch button DW takes FOREVER (and about 5 minutes) to look for changes then another 5 minutes to copy files. It's an impossible workflow. So, I wrote an Ant script to unconditionally copy the entire 1800 files from the working directory to the target directory. The Ant copy runs in about 4 seconds. Really. SWOOSH and it's done.
Update: I'm now working on a project that uses MathJax, which has 30,000+ files. Prior to adding MathJax into the project, I was really enjoying the workflow. Using one tool to edit, view, and update is really nice. When I dropped MathJax into place the update to local file system is impossible. I've let it run for over an hour now just because I'm curious. This is surely a bug in Dreamweaver.
So, why is DW so slow and can it be fixed?