Text area Jumpy and Buggy

I posted this over at Feedback and got no response. Since the latest update version 4, the text-edit area when in long files is jumpy. When I hit delete, or backspace or a number of other keys, the text jumps and my view is relocated up or done. I have to use control-f to find my place and resume typing. After the 40th time this gets very boring.

Here is an example page of what I mean: http://calvinandcalvinism.com/?page_id=5884. Its not just happening on this page.

While I like the new floating text/edit bar,the jumpiness of the page while in text mode is just ridiculous.

Is anyone else experiencing this and is there a way to fix it?
Ps I dont use the visual-edit area for a number of reasons so thats not an answer or solution for me.