• http://benchmarkjs.com/
• http://jsperf.com/
• http://www.broofa.com/Tools/JSLitmus/
• http://labjs.com/
• http://zoompf.com/

---

• http://stevesouders.com/controljs/ google code
• http://headjs.com/

---

• http://blog.getify.com/sanity-check-object-creation-performance/