Short lag spike when breaking and placing blocks

When placing/breaking blocks there is a short, but annoying lag spike
Notice the FPS in the screenshots below

System Specs:

A10 580k
8GB DDR3 RAM
HD 7950 (OC'd to 1 GHz)

Obviously my system should be able to handle minecraft at max settings easily.

To mods: Took 15 minutes looking through "lag" and "fps" search results for issues within 3 weeks ago