Add documentation on Performance Expectations

[joehoyle]

No description provided.

[johnbillion]

This has likely been discussed elsewhere prior to writing this page, but what do we expect a client to do with this information? The CDN and origin cache response times are effectively fixed, as they rely on known infrastructure and any variation indicates a platform problem that should be escalated, but the origin response time for uncached responses will vary greatly.

The information I want to get from this page is, given my website is responding in X milliseconds, is that within an expected range or is that a problem that needs to be investigated by the delivery team or the cloud team?

The 150ms response time for a base WordPress site is not going to happen for many sites, so perhaps a range of expected response times could help set expectations.

[joehoyle]

@johnbillion the intention is to provide baseline metrics so people deploying on Altis Cloud can understand the delta between their "site additions" and what a blank slate vanilla WordPress is likely to perform at. It also provides a baseline so they understand what minimum numbers are viable (if for example, they expect to optimize their code to get things responding in 50ms).

I think this doc could be fleshed out in the future though, with some more example setups. I don't think we should be blocking merging it now though.