Performance/Load test using selenium webdriver prerecorded steps

I have been using selenium webdriver as my main method to do functional tests. So far its been working greate with our product.

I need to do some performance and/or load tests on the website, I was wondering if there is a tool that would incorporate my selenium tests or a tool which i can use with the recorded tests as the base.

Currently i am using selenium webdriver with C#

Any help is appreciated.