Question about my site and Google.

All of my url's recently changed because I'm now using a component for search engine friendly url's for Joomla. But all my pages indexed by Google are my old url's which lead to 404 pages. What's the best way for those old url's to go away and my new url's to be indexed?

 

wait for the new urls to indexed.
old urls can be redirected using 301 htaccess redirect.

 

I'd have to agree, 301 redirect old URLs to the new ones is your only chance to save your current SERPs and Pagerank value, it will still take time before it all transfers over.

 

What about removing the bad url's in Google webmaster tools and setting the Googlebot crawl speed to fast for a little while?

 

I think, its not under our control. google sets the speed

 

In Google webmaster tools there's the choice to set the crawl speed to slower, normal and faster.

 

Thats the speed it crawls your site not to make it crawl more frequently.

 

yes..
but from fast, you can make slow.
but from slow, you cant make fast