To be productive, you need to be active, but doesn't mean that you have to put Nitrous Oxide on your feets. It's better that doing thing slowly but always doing well than doing faster and making mistakes repeatedly.
You need to be like a snail. The snail is slow, but doesn't stop moving. You can see it at a place, wait for a reazonable time and you will see it at a very different place. It's more useful to do little, but continuously well done work than try to do extremely faster and lose a lot of time fixing mistakes.
I know that I'm slow, so I'm trying this perspective. You can impress yourself when the job is done.