Last tested: Aug 19, 2020
Yep, sure is - 20 MB. If the file's larger than that, you'll see a "This file is too large to be viewed in the browser" error.
Even before you hit this limit though, you could have serious IDE performance issues. There was an example of this exact situation, and the culprit was a 110k line model file.
This content is subject to limited support.