I would occasionally run into this in previous releases, but it’s way more pronounced now. Essentially, I can’t use inline editing for any large text elements, because the builder doesn’t keep up with the typing.
Here’s a link to a dropbox video where you can see the speed at which the text shows up on the screen. I’m not the world’s fastest typist, but I’m typing way more quickly than the text is appearing within the builder.
You can also see that when I click outside the text element, it animates the typing all over again. Not shown in the video is that if you double click in the text element again while it’s animating a second time, you sometimes lose the text that hasn’t rendered yet.
Seems to get worse the longer you’ve had the page open, and the more edits you’ve made throughout the page.
This is happening in several of my test installs, in different environments, on both Chrome and Safari.