Originally Posted by
nswenso Updated my wife's 6 tonight and hers is running VERY laggy and slow. I force closes all apps, hard reset the phone, etc. not improving yet.
Again and again and again... It's already wriiten so many times here, self apple says it: wait some hours up to a day until the phone completly is settled. After an upgrade some processes are running and they can take some time. If you don't believe this then look for many other posts here, which say: "After x hours the problem is gone."
And if then the problem still is there, give it a try and make a fresh reinstall.