Boot time makes no difference of course. It is just a measure of machine speed. As for latency, I am doing "full boat" calculation, Round trip, because that is effectively what is happening.
I bought in 2016 the MSI GE72 Apache Pro. I took it because of the double cooling (2 ventilators) that can even go in Turbo mode. Very good laptop and never had any heating problems. I agree with you to keep all things as much as possible local.
I have an HP laptop with an OLED screen. I has quickly became my go to trading device. Very good at reading anything to be read.