This is one of the major advantages of Lisk over the other networks. Running the dapps on sidechains instead of the main chain makes it much more scalable. As many servers to run dapps as are needed can be added to the network.
Bitcoin and Ethereum are trying to address scalability with what amount to patches on top of the core technology, like Lightening Network for Bitcoin and State Channels for Ethereum.
With Lisk, scalability is built into the core design from the ground up.