Around 1000 km per second. Mph, come on.

Edit: says so right in tfa, I’ll take the come on back

Edit 2: the escape velocity of the milky way is said to be 550 km per second. The orbital velocity of the sun around the milky way is 230 km per second.

I think your third point is key, one thing Microsoft does very well is backwards compatibility. We run programs from the 90s in production. It is a nightmare of APIs layered upon APIs, but the programs will run.