timmmay:nathan: what are the specs of your machine and what Windows 10 build are you on?
when I Start, calc, enter it literally starts up immediately and can have numbers entered into it straight away
i7 2600K (which is about 10% slower than the latest generation), 16GB RAM, 120GB SSD plus various other disks, latest generation motherboard that fits that CPU (just replaced it).
What Windows 10 build are you on?
it starts up just as fast as a Win32 app for me