User blog comment:Kirkburn/Rich text editor overhaul launches sitewide/@comment-126761-20100125130835

About the "pre" tag showing as a puzzle piece, this is known - we plan to improve support over time.

Those of you seeing excessive slowness, knowing your browser would be extremely useful - especially whether it is IE6 or another browser. A quick way to tell is, does your browser support tabs? If not, it's probably IE6.