You can check
https://walletgen[SCAM]erator.net/ hope you can find it useful. Disclaimer: I haven't used the site before or used any address generator before.
Make your vanity addy online is one of the biggest mistakes you can do. Is easy for this kind of service to save each privatekey on MySQL and is about time for them to steal all the bitcoins from their customers. This is why the right way to user vanity gen is by installing it on your computer.
On the next wiki you will find the steps and your speed average on Mkeys/s
https://en.bitcoin.it/wiki/Vanitygen