You're assuming the product is slow because of the calculations and not because of UI implementation. You're also assuming that the calculations are extremely c

You're assuming the product is slow because of the calculations and not because of UI implementation. You're also assuming that the calculations are extremely complicated, by todays standards. People are doing pretty much the same calculations they did 20 years ago, on far faster machines; my laptop is faster than the supercomputer I worked on in the early 90s, my phone is way faster than my desktop was then. It's not unreasonable to ask for the calculations to be done on these machines.