Test speed of repeated require() calls

test.js

var iters = 100000;

// Many require calls
var start = process.hrtime();
for (var i = 0; i < iters; i++) {
	require('fs');
}
console.log('Many require calls: ' + process.hrtime(start)[1]/1000000 + ' milliseconds');

// Many noop function calls
function noop() {};
var start = process.hrtime();
for (var i = 0; i < iters; i++) {
	noop();
}
console.log('Many noop function calls: ' + process.hrtime(start)[1]/1000000 + ' milliseconds');

// Do nothing many times
var start = process.hrtime();
for (var i = 0; i < iters; i++) {
}
console.log('Do nothing many times: ' + process.hrtime(start)[1]/1000000 + ' milliseconds');

On my laptop running node v0.10.26 on OS X, I got:

Many require calls: 49.85532 milliseconds
Many noop function calls: 0.926823 milliseconds
Do nothing many times: 0.576822 milliseconds