Computers are also slow and sometimes getting slower, because real world applications are built with increasing layers of abstractions. while the hardware in the bottom layer is getting faster, the top layer is sometimes slower because there are so many layers and so much complexity in the stack.
Take this review of terminal emulator benchmarks: https://lwn.net/Articles/751763/
Uxterm, released in 1994 is the clear winner.
A "modern" terminal like Gnome Terminal has more than 10x the latency.
Booted an Electron app lately?