My CS3 version of Dreamweaver started freezing on files that were not small when I switched to code view. Well, the problem is known by Adobe and it relates to time changes (Daylight Savings Time) documented in Adobe KB402776. The article mentions ASP and PHP but my setup is for CFML.
The solution is to remove a file:
path: C:Documents and Settings[username]Application DataAdobeDreamweaver 9Configuration
After closing DW, I just renamed the extension to .dat_old and reopen DW. Give DW time to recreate it and all should be well again.