how does this video load?

Render at 14.98 fps, or 15fps, depending on the
source format. If you can get it down to 10 or
12 that's good too, but if you make fast movements
it'll look more blurry. For screen capture I usually
go as low as 3fps because then I can blow the
video up to 600x800 and still have a compact
file.

For live action, you have to balance window
size, resolution, and frame rate to get something
that is acceptable and streams well even on slower
connections. Reducing the size of your output
frame reduces the size of the file, sometimes by
a lot for a not very-big reduction in the viewable
frame size.

I would usually render a video, these days,
like what you are doing, in a 16x9 ratio. You've
got something closer to 3x4, which means your
video is taller for the same width and you've
got a larger file as a result.

I would render at 220 kbps for the video. Render
the audio in mono - 32 kbps is the lowest setting
I've usually been able to get good results with.

I believe stereo doubles the kbps so 32 becomes
64. Usually not worth it.

220+32 kbsp = 252kbps. When you get over 256
you start to create a situation where the video
will be hard to stream for some visitors.

I actually often render the video as low as 180 kbps
with 32 bit audio, but there is a drop in image
quality. It's all about how much you are willing
to compromise slickness to make your video
accessible.

Also use a 3-5 second buffer on your player.