alt Hacker NewsTCP/IP is, in theory (AFAIK all experiments related to this fizzled out a decade or two ago), a global resource when you start factoring in congestion control. TLS is less obviously something you would want kernel involvement from, give or take the idea of outsourcing crypto to the kernel or some small efficiency gains for some workloads by skipping userspace handoffs, with more gains possible with NIC support.
You do want to offload crypto to dedicated hardware otherwise your transport will get stuck at a paltry 40-50 Gb/s per core. However, you do not need more than block decryption; you can leave all of the crypto protocol management in userspace with no material performance impact.