If you look at
Simple Tooltip I use object pools to make and recycle tooltip controls. I don't claim to be an expert, but it does work and I have used GetTotalObjectCount() to make sure the pool is not running away (I left the object checks commented out in the code). If you look at the documentation in Simple Tooltip, I think I give you enough to get an easy start.
I did not know about control pools so I might look into those.