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Choosing to deploy the VM template to a shared storage cluster may not be the best approach for troubleshooting slow performance. In many cases, if the shared storage cluster is already overloaded or not configured optimally, it can contribute to performance issues rather than alleviating them.

The other options focus on immediate improvements that can enhance performance. Increasing network throughput directly addresses potential network bottlenecks that can slow down the deployment process. Reducing the size of the virtual disk can lessen the amount of data being processed, which helps speed up deployments. Changing the destination datastore to one that is less congested or has higher performance characteristics can also help mitigate slow performance issues.

In summary, while considering a shared storage cluster could be important in a broader context of storage management, it is not recommended as a troubleshooting step specifically for addressing slow performance during VM template deployment.