In an article from Crazyegg mentioned that:

\" A one-second delay in page load time yields:

11% fewer page views
16% decrease in customer satisfaction
7% loss in conversions

A few extra seconds could have a huge impact on your ability to engage visitors and make sales. \"

How to speed up our website?

-->> This is one the tools that very useful we could try >> https://gtmetrix.com/
https://pictr.com/images/2019/02/15/0vtkfO.md.png

If you can see in the image, the result i found for My Webpage

https://pictr.com/images/2019/02/15/0vtqrZ.md.png

So, you can see, the score from the top is the lowest. (the red colour).

From the result, we know the image we used is need to be scaled. You can scale by using the simple step from WordPress backend.(by: edit image)

I give you the plugin use for compressing image ->> TinyPNG. 
I found this tool is very useful for compressing image but it has limited quota in a month.

I think thats all for now. I hope this is useful for you.

Please share your suggestion more about speeding website.. Thank you.

Thank you.