See: https://github.com/alphaonex86/Confiared/blob/master/sitespeed.py

• No support for ARM and Aarch64, firefoxdriver/chromedriver it's x86 and x86_64 only!
• some extra tool is need, not updated, linux don't compil it, I use wine
• Some limitation for cgi (I use lighttpd for that's)
• Slow on low end hardware

• driver.get_screenshot_as_file('/tmp/test.png')
• convert -thumbnail 280×230^ -gravity North -extent 280×230 test.png test2.png
• pngquant
• base64