Ethereum, although distributed, is basically as fast as its slowest computer in the network.
An Intro to TrueBit: A Scalable, Decentralized Computational Court.
Simon de la Rouviere

Certainly not! Just think about it: that would allow to freeze the network by adding a extremely slow node. I think a slow node just never mines because its merkle tree gets rejected as holding the wrong state, or it takes him so long to compute the new state that the other nodes already proposed a new block

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