Low GPU/CPU usage with low fps

I am running Iris with nightly build of DH. When I first load in I am averaging a high fps but as more and more chunks load in I slowly decrease and will then sit around 15 fps. I have a screenshot of my usage and have already tried to increase ram allocation to Minecraft to no avail. Any ideas on how to fix this?

Solution:

Thank you to at @Puhpine (GMT +2) : "This is an iris issue, where it is spamming errors when no shaders are loaded. Try running a shader" This fixed my issue...

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