Tons of difference..... E=1/2mv^2. Lots more energy at 250 mph. I know you said "risk management", but you can see the picture!!

There are few sport jets out there that can do 200+ mph all day without having to dive. BUT, most jet pilots are respectful of such planes and manage their speeds well. Flying at 200 mph thru the 5-7 min flight is no fun and like I said, most pilots fly their jets at good speeds that are pleasing to the eye and are enjoyable to the pilots.