Streaming Vimeo - What's the best t

Hey there. Question for you all if you know. We have a VIMEO PRO account where we’re hosting our videos. Those videos are being added to our website via iframe: www.stable.stable-demos.com.

My question is, what is a good target size for these videos?

When I have no videos on my page, my page size is small. Once I add the videos, even though we’re not self hosting, the page speed drops by about 1000% and the “fully loaded” time goes from 3 seconds to 34 seconds. https://gtmetrix.com/reports/stable.stable-demos.com/2dLdV7mY

We’re also getting a bunch of inconsistent URL errors, but that’s another issue (we have a ticket out to VIMEO for that one).

What is a good target size in KB or MB? What’s average? What’s too much?