I have a Microsoft keyboard that has a dedicated Calculator button. In older versions of Windows, I used to press that button and start entering numbers right away. But in newer updates of Windows 10, I now have to press the Calculator button, WAIT FOR THE CALCULATOR TO LOAD, and then start typing my digits. I think this is ridiculous.
Agreed. The market for super snappy user experience seems to be underserved. Maybe not enough demand? Or maybe a symptom of the "everything is free and paid for with advertising" model we have today.
If you were using Linux, solving your problem would be trivial. Practically, I can only recommend using a non-local calculator such as a search engine, since despite network latency that codepath is more heavily optimized and people now spend so much time in browsers. CTRL+L (address bar) then type "100+50/25=" and press enter. Bingo.