From a performance point of view, ECC certs are significantly smaller than RSA certs at a comparable level of security.
Smaller certs translate to fewer bytes going over the wire when doing TLS handshakes, reducing latency.
But it was really their lack of HTTP/2 push support and how their CDNs don't support H2 prioritization correctly[1] which annoyed me to the point of going back to Digital Ocean and running my own instance of H2o where I have full control.[2]
Provided it fits into a single Ethernet frame it's not going to make any difference, right?