Extremely fast logging system. Put this at the TOP of any script and call `log()` when you're complete.

logging.js

"use strict";

// Average completion time: 9.57 ms
const [ a, o, ms, s, log ] = ( function * () {
    yield * [
        ( process.hrtime )(),
        process.hrtime,
        ms => ( ( ms[ 0 ] * 1e9 + ms[ 1 ] ) / 1000000 ),
        s  => s / 1000,
        () => {
            const f = o( a ), msf = ms( f ), sf = s( msf );
            return { a, o: f, ms: msf, s: sf };
        }
    ];
} )();

setTimeout( () => {
    console.log( `Benchmark results ${JSON.stringify( log(), null, 4 )}` );
}, 1000 ); // add a second



// And in a clean class

"use strict";

class Time {
	constructor( name ) {
		this.name = name = name || "time";
		
		const
			ms = ms => ( ( ms[ 0 ] * 1e9 + ms[ 1 ] ) / 1000000 ),
			s  = s  => s / 1000,
			c  = process.hrtime();
		
		this.start = () => {
			const a = process.hrtime();
			this.start = a;
		};
		
		this.stop = () => {
			const o = process.hrtime( this.start ), msf = ms( o ), sf = s( msf );
			this.stop = o;
			this.ms = msf;
			this.s = sf;
			this.time = name + ": " + msf;
		};
		
		this.creationTime = ms( process.hrtime( c ) );
	}
}

let x = new Time( "name" );
x.start();
x.stop();

console.log( x );

console.log( x.ms );

Next - make this reusable throughout the code