Just for curiosity, I created a 5$ - 1 GB - DO Ubuntu LTS machine to run the Stock Prices example. I created 8 GB swap memory on the SSD disk just in case but the robot never touched that.
This is pretty good actually.
Of course, working on more complex web pages and with larger Excel files would consume much more memory, would be slower to run but good to know you can run your robot on a 5$ Linux box.