What else should I do?

Hi there,
Please help me in improving the upload speed of our website.
I’ve been using WP Supercache and Hummingbird plugins and activated all the features.
Still, the page size is more than 2MB and Fully Upload time is 9.8 sec.
Here’s the screenshot https://snag.gy/ZaIhSB.jpg
https://snag.gy/RqpxIK.jpg

Please tell me what else should I do as I’m a novice. So kindly explain in the detailed or step-by-step procedure.

Thank you so much.