Meanwhile on Chromium 26.0.1384.0 (build 176849) on OS X Lion everything is fine for me. The titlebar is (appropriately for the typography) messed up, but there are no tab loading issues, cpu/memory spikes, or screen corruption. The closest thing to an issue I see is that it makes using Witch's window switch dialogue a bit ugly. Contrary to the thread on jwz's journal YoruFukurou 2.77 doesn't crash or misbehave for me viewing that tweet, but behind the scenes fontd uses up a decent chunk of cpu for several seconds. Perhaps Mountain Lion has more severe bugs in CoreText?

And apparently Twitter puts the content of a tweet in the <title> tag if you are on the page for a single tweet. Surprised that doesn't cause more problems.

After reducing the html-code in the site, it seems to me that it is not the title that causes the crash, but the p-tag with the specific css-style applied.