As far as I'm aware, Kagi does NOT employ quantum-safe key exchange, like x25519mlkem768. This slightly increases bandwidth usage, although most modern systems should handle it.

This should prevent store now, decrypt later attacks. This is helpful for privacy-minded individuals who are concerned about these types of attacks. Privacy Guides recently implemented this with their forum, using a (currently) beta version of Caddy. AFAIK, Kagi uses Google's load balancer, therefore this is likely infeasible until Google implements it. Worth a comment about it though.