The modern ones don't anymore, we have a couple of Microsoft Surfaces at the office and they're quite snappy.
But they're so expensive and small compared to a blackboard. Another commenter got a 4 foot x 6 foot blackboard, it was probably a few hundred dollars (plus the cost of chalk) and will last for decades. A 50' Microsoft Surface Hub, that's ~2 1/3 foot x ~3 1/2 foot, is ~$9,000 and will be lucky if it lasts 10 years.
There are cheaper large touchscreens but they won't use capacitive sensing which is what makes the Microsoft Surface "snappy."
Also not so good in a blackout.
Our Samsung Flip is really snappy and relatively affordable. Still enjoy whiteboards more though.