The irony of Pingdom going down.

That happiness when Pingdom alert get closed automatically after 2 mins.

BPOS client sub contracts a website and wants a WordPress one. Creates a design based on a theme.
This particular theme has a demo page.
And when running it through pagespeed insights returns a score Of 29.
Pingdom score of grade D.

Halfway through "development" we get a complaint from BPOS that the site is returning a score of 49 and a Pingdom score of grade B.

Considering how bad the theme is and how optimized we got. I believe that this was a miracle.
The things we do to make a living.

I need help speeding up my website. It's hosted on GoDaddy shared and uses Managed WordPress. I've run tests on Pingdom, PageInsights, GTMetrix and load times vary from 1.3s to 5s depending on the server location. Apparently Managed WP GoDaddy uses a CDN and their own caching plugin (Varnish). I don't know if that's good or bad.

PageInsights says I need to optimize images. I'm using WP Smush but clearly it isn't helping too much. I always manually resize all my images to <=100kb.

Also, the age old leverage browser caching problem... How do I fix that?

Thanks a lot for taking the time to go through this :)