PHP Multiple Curl Requests

I'm currently using Curl for PHP a lot. It takes a lot of time to get results of about 100 pages each time. For every request i'm using code like this

$ch = curl_init();

// get source

curl_close($ch);

What are my options to speed things up?

How should I use the multi_init() etc?

• Reuse the same cURL handler ($ch) without running curl_close. This will speed it up just a little bit.
• Use curl_multi_init to run the processes in parallel. This can have a tremendous effect.