From first principles, one shouldn't expect the menus or other simple rendered parts (things not involving backend traffic) of a user interface to have any perc

From first principles, one shouldn't expect the menus or other simple rendered parts (things not involving backend traffic) of a user interface to have any perceptible lag on a sub-100 processor, be it an application for web, mobile or desktop. Most likely they shouldn't involve millions of computations or hundreds of megabytes of memory reads. But looking from the other end, somehow they definitely do. And we're probably wasting trillions on this problem. Wasted time, wasted electricity, wasted batteries, wasted computers and phones.