Cordination is very important here. Once you get the feel, you´ll be abel to blow it away as fast as you want.

Here are some common useful patterns:

-----------5-7-8-5-7-8------------
-5-7-8----------------------5-7-8--


--------------------7-5-7-8-7-5---
-7-5-7-8-7-5-----------------------


-------------------5-8-7-5-7-8--
-5-8-7-5-7-8--------------------


----------5-7-8-10-8-7------------
-5-7-8---------------------10-8-7-

Simple but useful and you can hear stuff like this in lot of shred guitar solos. It´s very common, cool, and you can really speed it up so don´t be afraid to use ´em.