Wordpress website www.jmofoto.com Load time

Before I had wpmudev i was getting load speed of 1-2 seconds
I have done all that is possible to improve my websites load time using hummingbird
I am still getting load times of 4/3 seconds
I have a VPS
and i paid for CDN
Which i am using MacCDN
What do I, need to improve me load time I thought hummingbird would help

Also smush is saying that all the images have been optimized but humming bird and google website speed test say thin

Compressing and resizing https://cdn.jmofoto.com/wp-content/uploads/2016/07/benardgutwa.jpg could save 77.2KiB (82% reduction).

Compressing and resizing https://cdn.jmofoto.com/wp-content/uploads/2016/07/photographer.jpg could save 32.1KiB (96% reduction).

Compressing and resizing https://cdn.jmofoto.com/wp-content/uploads/2016/07/juniorchurch.jpg could save 30.9KiB (79% reduction).

I do not know what to do because the images have been optimized to the maximum