Why does Visual Studio 2015 lock up when editing a .json file?

Question

I created a brand new file named RequireJS.json in Visual Studio 2015, and while typing and copying and pasting to build my JSON object, I noticed that VS would continually lock up for around 10-20 seconds at a time. This seemed to happen more often as I switched tabs, then came back to the .json file. I restarted VS, then restarted the computer, but it continued doing this. No other files or file types are lagging like this. Why would this happen only with .json files?

Answer 1

Since this was only occurring with JSON files, I wondered if it had something to do with Visual Studio's text editor, so I took a look at the VS options under Text Editor -> JSON. I noticed under the "Schema" section, it was pointing to a schema catalog at an external URL (http://schemastore.org/api/json/catalog.json in my case). I unchecked this box, with the thought that VS might be lagging trying to download the file or something, and that must be right because I haven't experienced any VS lags or lockups since unchecking that box.