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We have reports from three nbusers regarding degradation of performance while in css editor. Ref: http://www.nabble.com/VWP-CSS-editor-slow-as-molasses-in-Antarctica-tf2943523.html#a8246821 http://www.nabble.com/VWP%3A-css-editor-unusably-slow-tf3156738.html#a8755015 QA has replicated the problem.
Here is a repeatable scenario: 1. Create 3 new fragments on a page. Add one button to each fragment. 2. In the Project Navigator, copy and paste page1 to get page1_1, page1_2. Total 3 pages only. 3. Double click on stylesheet.css, start typing and watch responsiveness crawl. The above is a simple yet reasonable scenario as multiple fragments are often used for headers and footers of a page.
*** Issue 96627 has been marked as a duplicate of this issue. ***
Winston has checked in a fix to VWP 5.5.1.
I meant to change it to "FIXED" based on my previous comment
Verified with NB 03050600 and VWP 0313_1.