IPR windows spikes GPU usage to 100% at image update

[itsallgoode9]

I noticed that when i'm using IPR, my graphics card used for my monitors spikes to 100% for about a 1/2 second every time the IPR window updates, which temporarily freezes maya. This means I have to raise the window refresh rate to it's highest limit so that my card isn't super laggy. Is this a bug? It doesn't seem that simply updating the image should cause my GPU to spike to 100%.

I'm running 2.15 and have a quadro 4000k for desktop and 2x 780's for rendering. I don't recall for sure if this was an issue on older versions or not but I don't think it was.

[itsallgoode9]

any help? is this a bug or expected?