> In this experiment, we have stored all the dictionaries in a list and dumped the list using json.dumps()

I completely failed to read this the first time I went through. I guess this is equivalent to dumping bigger dictionaries.

> [Warning: Anecdote] When we were testing out the various JSON libraries we found simplejson much faster than json for dumps.

Turns out we were using sort_keys=True option, which apparently makes simplejson much faster than json.