The clustering impacts performances because:

- Gathering, transmitting and applying the synchronization data takes time,

- Waiting for all computers to finish their rendering, so the cluster is necessarily as slow as its slowest computer.

Here are tips to improve performances:

- If your application is executed from a network drive, make sure to deactivate Unity's logs (Player Settings > User Player Log) because writing logs from across the network is slow.

- Synchonize the minimum number of nodes.

- If the master has a different refresh rate than the rest of the cluster, use the Disable VSync on Master option.