it's the required escaping of quotation marks!! if you have non-english users and didn't turn off escaping of non-ascii then you're in for a real surprise :) length-prefixed strings would solve this.
also, memory allocation penalties can hit you hard, depending on your environment, since it's hard to predict what you'll need to allocate when encoding / decoding json
also, memory allocation penalties can hit you hard, depending on your environment, since it's hard to predict what you'll need to allocate when encoding / decoding json