Oh, yeah, for good clients it's totally fine. But e.g. a machine I'll try an http benchmark on in a couple hours (2 cires; 4780 BogoMIPS each) only managed 4177 ops/s using the fastest-available curve X25519 with

  openssl speed ecdh
  
  gatling -V -n -p 80 -u nobody

I know this is somewhat extreme, but on a cpu that was about 30% faster I got 40k rps for small files using the kernel's loopback, which is where the cpu spent most of it's time.

Feel free to try.