I have logged a bug for the date picker issue.
In the mean time, try disabling the preview to increase the load time
WebAssist -> Preferences in the Preview section, select the Disable preview option
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.