"Its a java based conflict that chrome is battling, and has been since the very beginning. Obvious advice is to disable extensions, then disable java within chrome. Its almost a definite that you will see improvement afterwards, to further speed it up change to the google dns, disable HTTP scanning in your AV, and make sure you're not running any 3rd party java apps with google (unless its just the java applet from sun micro)
For lightweight browsing security use adthwart instead of adblock plus.
Internet Download Manager destroys google chrome at the moment so you will have to choose one or the other.(Makes chrome un manageable)
It seems that chrome definitely conflicts with other programs that use the internet in certain cases. So if it seems that it can't be chrome then it probably isn't. To know for sure shut down all programs except for chrome and see how it runs then, and if it still is slow then you have a java conflict."