Something I noticed is that on Windows 10, the Metro “calc” app is slow to start.

The damn calculator app. Starts up slowly. Even on an SSD.

How can you make a calculator app slow to start? I used a calculator app on a MacIntosh in 1986 on hardware that was literally 1/10,000 as fast as what we have now — and it opened in less than a second.

But some wit over here said it best about what the calculator app is actually doing. Comment reproduced in full:

That’s because rather than loading calc.exe when you type calc it actually doing far more:
1) Adding “calc” to your database of invisibly tracked user information
2) sending that updated database to Microsoft
3) waiting for Bing to generate some useless internet search results for “calc”
4) looking through all its indexes for every file on your PC for the word “calc”
5) searching the Windows Store for premium matches it can sell you for “calc”
6) thrashing the storage subsystem whilst you wait for calculator to appear in the start menu because it hasn’t been rebooted in weeks, only hibernated and superfetch-readyboosted in a false attempt to speed up your boot times.
Eventually, it decides that it can’t monetise your four letters and begrudgingly shows you the shortcut that Windows Vista and 7 displayed so fast that you’d have needed a high-framerate camera to have spotted any delay.

The more I use Windows 10, the more I hate it. Letting the morons win in computing has produced nothing but harm.