Upon starting a node we currently print some brief hardware metrics.
This could be extended to include a warning in case the node has bad performance and was started with --validator.

The logic for comparing results and having a baseline is currently in utils/frame/benchmarking-cli, some of this would probably move to sc-sysinfo. sc-sysinfo would profit from this since it can use Throughput types (and other) instead of just u64 in some places.