There was a startup posted here which built custom hardware that let the AI respond instantly. Thousands of tokens per second.
They seem to be doing well. I checked recently and their API is closed to signups due to overwhelming demand.
I.e.: burn the weights into resistors with a range of possible values, and do the sums through simply adding up the currents along parallel paths by simply connecting them!
They built an entire wafer ASIC. The entire thing is one huge active ASIC. it takes a lot of cool engineering and cooling to make it work, and is very cool.