It's that time again! Jim Cramer rang the lightning round bell, which means he gave his take on caller favorite stocks at rapid speed:

Calpine: "I don't like the power generation business. It's just too up and down. That's why I like AEP, and my charitable trust owns that one."

Synergy Pharmaceuticals: "It's down a lot, I'm not recommending any of the speculatives right now. I'm just not, they are losing people too much money. Why don't you just buy a Celgene? Celgene is doing quite well."

United Rentals: "I think it bottomed. I have been reluctant to recommend it, but I think when I see Caterpillar go from $69 to $78, I think you've got a fighting chance. Don't forget, what brought down URI was that oil business. They were not as open about how bad that oil business could get. But guess what? It's getting better. It bottomed."

Nanthealth: "These cloud-based information system companies have tended to work. They have tended to work, I just don't like them on that opening day."

Devon Energy: "Devon did a secondary at $19, the stock is at $37. Can you believe that? We missed Devon Energy. Let's leave it at that."

Texas Roadhouse: "A blowout quarter! The first of the restaurant chains that really delivered a great number. I was just dazzled by it. I like it, I didn't know it was that good."

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