But the thing is most neuroscientists don't just sit at a computer all day. 95% of the tasks they do are not computer-bound.

If you're doing animal-based research (the majority of real neuroscience currently), then its time spent with behavior testing, surgeries, waiting for the drug to be in an animal for 72 (or however many) hours, processing slides, pipetting, etc.

The time spent at a computer is mostly data analysis, reading papers, ordering supplies and grantwriting. A huge amount of time seems to be spent jumping through hoops, ordering things, working with vendors of equipment that doesn't frequently work as advertised, and dealing with broken stuff overall. The data-analysis they are doing again, isn't bound by the computer's speed. It generally is working with a few dozen (or hundred) samples of relatively computationally easy data.

There's not much for a computer to speed up.