Update: the upcoming new release has this... I love it! Renders instantly regardless of the test size or connection speed. -- it's actually a combination of the current server-side rendering and client-side rendering. Came together extremely fast once I got on the task actually. I mean... it's totally instant. Also saves everyone time and bandwidth, sweet!
... the upload test will also include progress. Works amazingly too.
Such an optimal idea, thank you! PM me if you want beta information.