Just found this out when trying to google when Minecraft is opened and dosen't respond apon opening Task Manager Minecraft was using 100% CPU and 2% GPU even I force it to use my NVIDIA Geforce 940M (Notebook).

Yes I'm using a laptop with dual Graphics but I'm getting frame capped since its being demanding on my cpu I gave Minecraft 4 gb allocated and 4 gb left for my pc.

Using Optifine but I tried it on Vanilla but still the same results.