I'm editing a JSON formatted text file in Mac OS X Mountain Lion (10.8.2) on a 2.3 GHz Intel Core i7 with 8 GB of RAM.
The file is approx. 3 MB large so it's not very big. Anyhow this is making both TextEdit and Coda 2 to use 100% CPU. I really do not understand what is causing this behavior.
File in question: download link