possibly helpful: http://composition.al/blog/2015/11/29/a-better-way-to-add-labels-to-bar-charts-with-matplotlib/

Some tests reuse variables like this:

x=x+1

Thus, x gets larger every cycle. The program times stuff by waiting until it's taken a certain amount of time. Which means that, when an operation takes less time overall, it can grow variables quicker, and therefore skew later results and therefore the end result. This isn't a huge problem with integers, but e.g. in the array concatenation test, it really throws off results.

should include at least a+b+c, f"{a}{b}{c}", and "".join(a,b,c)

The initial launch size of the window is too small to properly see the results of the benchmark.
The window is still resizable and can still be maximized, though.

Operating System: Ubuntu Desktop 20.10 x86_64
Desktop Environment: GNOME 3.38.2

probably good to do simultaneously with #3 and #5