Memory use and speed of JSON parsers 22 November 2015 (updated 15 December 2015) Note TL;DR: In decode oriented use-case with big payloads JSON decoders often use disproportionate amounts of memory. I gave up on JSON and switched to Msgpack. You should draw your own conclusions by running the test code yourself. ⸻ Based on various feedback [*] I've did the benchmarks again, using ru_maxrss instead