test.js

var Benchmark = require('benchmark'),
    jade = require('../'),
    fs = require('fs');

// Test cases

var cases = fs.readdirSync('cases').filter(function(file){
  return ~file.indexOf('.jade');
}),
    pretty = {},
    prettier = {},
    locals = { title: 'Jade' };

cases.forEach(function(name){
  var path = 'cases/' + name;
  var str = fs.readFileSync(path, 'utf8');
  var fn = jade.compile(str, { filename: path, pretty: true });
  pretty[name] = jade.compile(str, { filename: path, pretty: true });
  prettier[name] = jade.compile(str, { filename: path, prettypretty: true });
});

var suite = new Benchmark.Suite;

suite
.add('pretty', function () {
  for (name in pretty)
    pretty[name](locals);
})
.add('prettier', function () {
  for (name in prettier)
    prettier[name](locals);
})
.on('cycle', function (event, bench) {
  console.log(bench.toString());
})
.on('complete', function () {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
.run();

Run from jade/test

Results on my box are:

c:\cloned\jade\test>node test
pretty x 1,058 ops/sec ±0.52% (60 runs sampled)
prettier x 858 ops/sec ±0.92% (59 runs sampled)
Fastest is pretty

So "prettier" takes longer by about 25%.