How pino is faster than other library?

Question

Pino is fastest json logger in the town but how it achieves better performance than others like winston, bunyan, morgan? As per https://www.nearform.com/blog/pino-the-fastest-node-js-logger-for-production/

1. Optimized JS code, e.g. for serialisation and string operations
2. Pino streams logs in line-delimited JSON format to any given output stream (default: standard output stream)

can someone elaborate point 1 and 2 with example?