Honestly it's pretty abstract even if you know what's going on. Just think of it like light causing other waves that look mixed with light making it all muddled up and looking slower.

An integrated GPU is a seperate GPU inside the processor, it's not using the CPU to compute graphics. If you look at internal layouts of a processor with an iGPU, you'll see the GPU as a seperate object. So displaying doesn't slow down the CPU part of the CPU(that much, there could be bandwith issues).

A discrete GPU is what goes into a pcie slot and is a GPU outside of the processor. This is what most games require as the iGPU is mostly only enough for displaying and maybe processing video.

Software rendering is using the CPU cores themselves to do graphics tasks.

Well there's definitely an upper upper limit, the point where the mass of the antibodies is bigger than the person.

I meant a scenario like this, where, could there be trillions of trillions of vaccine, or is there an SSD somewhere in the body that'll fill up.