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Help a newbie - size of my Docker image / did I do it right?

I have just configured and built my first docker image ( due to the fact that I could not find a docker image using the latest version of Smokeping and PhantomJS.

I tried to squash/reduce the size of my image, but I can not get it any smaller and I am starting to think that I perhaps made some obvious mistake.

I would appreciate it if perhaps someone could have a look at my Dockerfile ( and suggest improvements.

I also noticed that my automated build times out (Qt alone takes a good 3 hours to build).