Calculator on my Windows 10 opens instantly, same as it has in previous versions. My laptop has a dedicate button for it, on my desktop I have the icon pinned to the task bar.
I am considering ditching my gmail because it is becoming increasingly poorer and poorer. Performancee even with a 150GB cable connection can be agonizingly slow - using Chrome as the browser! On my iPhone, it constantly locks up the native Mail app (my work Office 365 account - never). On my iPad, the GMail app has the same performance issues. And more and more I find legitimate emails I have received for many many years (mainly newsgroups and similar) are half the time ending up in my spam folder despite repeatedly tagging them as not spam.
And thanks so much Google for now dropping Chrome apps unless you are actually using ChromeOS.