Depending on what you mean by "faster", there are applications when high power output is required at high frequency where tubes still win. Klystron tubes are an

Depending on what you mean by "faster", there are applications when high power output is required at high frequency where tubes still win. Klystron tubes are an example: https://en.m.wikipedia.org/wiki/Klystron https://en.m.wikipedia.org/wiki/Klystron