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Recently I found that IconServicesAgent began to grow up to 130-200Mb but before it was max 6Mb..
As far as I remeber last things that I was installing were Vagrant and Virtualbox. Not sure that this is connected but anyway somehow it started to grow.
I recently had the same problem, the problem came because I have deleted everything in the /var/folders/ which is an temporary folder, but apparently OS X is depending on a folder inside the tmp folder.
So if you run the following command from Terminal it should go back to normal again (at least that fixed it for me):
mkdir ${TMPDIR}/com.apple.IconServices
See this post: link
