Any chance to move tracking calls to use HTTP2 protocol in order to take advantage of performance? In our particular Adobe Analytics use case we have many resources requesting from the same exact domain and instead of sharding the domains it would be great if HTTP2 was used in order to allow multiplexing and other benefits to kick in.
Fastly has had HTTP/2 available for all of its customers since last Fall. You can see their write-up on the benefits of it here: https://www.fastly.com/blog/http2-now-general-availability
Additionally, you can see Information on the benefits and features of how HTTP/2 solves the "head-of-line blocking" problem here: https://http2.github.io/faq/#why-is-http2-multiplexed
