Performance insights, Server-Timing, log duration of activities from server

[joepio]

Atomic-Server is very fast, and I'd like to keep it that way. Or actually, I want more. Writing fast apps is addictive!

Anyways, in order to do this, I'd like to get more insights into what takes most time. I can do two things:

• Profile while developing, using something like flamegraph
• Using the HTTP Server-Timing header.

Server-Timing Header

Using headers has some nice advantages:

• You can debug slow responses in production
• Nice UI baked into browser

But implementing it could be a challenge. I'd like to provide at least the following insights:

• Getting resource itself
• Authorization checks
• Serialization

[joepio]

I've added the header, but as expected it isn't that useful now, as 99% of the time is spent in get_resource. If I want to analyze what that does interenally, I could add a Timer as an argument when calling get_resource_extended. But I don't like adding more arguments there...