Well The situation is tricky.
What happens if we speak with both employees about the situation that we are going to loose our jobs if we don't perform. I think it is the manager's duty to have a open chat about attitude problems at the first instance and be prepared to loose if he is not going to change. In my experience, most of them fear and change. It would then require a monitoring for a period of time till you are comfortable to allow people to be on their own.
SO to solve the problem here, depends on the manager and not on the two employees. If the manager is good, he must be able to own up the work hire a fresh talent and train to meet productivity. If speed is a problem address it. If attitude is a problem educate, educate and eliminate! At the end of the day. From the organization's perspect, I would remove the manager and get a new one. Delivering with what we have is the job of the manager. Not complaining about the subordinates are having attitude or learning problems.
I quote from one of the blogs that I read regularly from Parkash Iyer:
I believe everyone has greatness inside of them. And we all owe it to ourselves to rise to our peak potential. There are a few quotes that probably sum up my thinking. "If you think you can, you can. If you think you can't, you're right." "If it's to be, it's up to me." "It's never too late to become what you might have been." "Winning is a habit. Unfortunately, so is losing." "On your deathbed, you could be saying one of two things. I wish I had. Or... I am glad I did." "You don't win a silver. You only lose the gold." "Leaders create leaders. Not followers.
Link is:
The Salad Bar: Pig. And Other Games People Play! <link updated to site home> ( Search On Cite | Search On Google )
Best regards
Harsha