Pretty sure caching doesn't work

Newbie here, site is running fast with 2.5k uniques on $5 digitalocean VPS (nginx,redis,hhvm) but I don’t think caching is working properly.

I am getting 2.5-5s load times

Here is screen of headers, it’s not working right?:

It seems you are using cloudflare. Cloudflare has it’s own cache.

What command did you use while creating site?

ee site create --wpsubdomain --wpredis --hhvm

Between that I experimented with pagespeed but it caused more problems then good so I turned it off.

Yes, I am using cloudflare, so that makes redis useless ?

In network admin panel your plugin shows redis as working.