My 2001 Lincoln TC overheated a few times, I never let the needle raise all the way to high, once it went past normal I would shut it off. So I didn't notice any power loss.
What I did was went and got a coolant flush and blew my radiator off with compressed air, I had a ton of bugs and debris on my rad. Since then everythings been fine, I now have 212k on the clock I did the flush at about 200k.