Is UI performance better in apps where user per-minute labor is expensive? How about apps in a time-limited multitasking workflow?

Bloomberg terminal and some point-of-sale systems were well regarded on interactive performance. What tooling was used to optimize their performance?

If we can use LLMs to rewind/recall activity, can we use continuous profiling (e.g. eBPF) to identify interactive hotspots in complex user workflows?