Cramer's Lightning Round: Diamondback Energy is a buy

• 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.

Celsius' year-to-date stock performance.

Celsius: "I'm liking Celsius."

SLB's year-to-date stock performance.

SLB: "SLB did not deliver. I feel terrible, because I like the company very much, but it was weak."

Diamondback Energy's year-to-date stock performance.

Diamondback Energy: "[buy, buy, buy!]"

Pioneer Natural Resources' year-to-date stock performance.

Pioneer Natural Resources: "I want you to ka-ching, ka-ching."

Palantir's year-to-date stock performance.

Palantir: "I like Palantir."

Travelers Companies' year-to-date stock performance.

Travelers Companies: "If you want the insurance business, I'm going to say Progressive. I think Progressive's better."

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