Hybrid Post-Quantum KEMs: Performance vs. Future-Proofing in Distributed Systems?

I've been thinking a lot about the architectural implications of adopting hybrid post-quantum key exchange mechanisms, particularly for critical access points like SSH. The idea of combining a quantum-secure algorithm with classical ECDH makes a lot of sense for immediate security and future-proofing. However, I'm curious about the real-world performance overhead, especially in large-scale distributed systems where thousands of SSH connections might be established daily. Are we seeing noticeable latency increases with these new algorithms? What's the best way to benchmark and monitor this impact at scale? And perhaps more importantly, how do we balance the undeniable need for future security against potential operational performance hits in systems that demand low latency and high throughput?