Cramer's Lightning Round: Don't sell Trade Desk

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Trade Desk's year-to-date stock performance.

Trade Desk: "It absolutely is working, it's doing fantastically. And Jeff Green is doing a remarkable job, and lot of people prefer it to Google. So I will tell you that even though it's a very expensive stock, it is a good stock. And I would not sell it, I'm more inclined to buy it below the 80 level."

Edwards LifeSciences' year-to-date stock performance.

Edwards LifeSciences: "The new product line is very good, the stock is pulling back here. That may be the right level to buy it. They are doing very well now."

Delta's year-to-date stock performance.

Delta: "I like Delta very much...I like it, I like United, too. I think they're both good. Now, remember, they're very inexpensive stocks, but they trade wildly. But I do like Delta."

Freeport-McMoRan's year-to-date stock performance.

Freeport-McMoRan: "I want it to come in first, it's been straight up. I do not like parabolic moves.

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