I was using a software to capture the screen as GIF. The original file size for a single file was around 2x mb. I am by no mean an image expert, so I only used ImageOptim and some online services. And they are what I got. I will be glad to know if you know how I could downsize improperly a GIF.
Program like iPython doesn't work in serial-terminal. The simpliest reason is that it needs the ability to go back to the previous line to allow multi line editing.