Cramer's lightning round: Microsoft CEO Satya Nadella is 'doing such an amazing job'

• 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.

Vodafone: "It's a tough one because it's got a good yield .... but I really do prefer AT&T. I just think it's less risky and I don't want you to have a lot of risk in your portfolio."

Taiwan Semiconductor: "I like Taiwan Semi, they're very good, but I'm going to ... raise you with Nvidia — faster growing and better."

Marketaxess: "Honestly, I think that stock is a very, very good stock. They've got a very good business model."

Sirius XM: "I still stand by it. ... I like it very much."

Microsoft: "Oh, I think that [CEO] Satya Nadella is doing such an amazing job. I think he's got — he has all systems going ... He's good to go."

GrubHub: "Oh, my friend, that space is too competitive because they've got that DoorDash going against them, shooting against them."

Inseego: "Interesting 5G play."

Disclosure: Cramer's charitable trust owns shares of Nvidia and Microsoft.

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