Every time I look for "web page speed" I get results about the loading time (i.e. milliseconds)

Is there a feature to get the download speed graph (i.e. bit/s or something like that) throughout the whole page loading?

I hope the question is clear enough.

too low resolution for today screens

If you pin a tab most likely you are interested in keeping that specific site/url handy. But sometimes you would type in a different url and end up messing up your original pin.