Which weighs website a website down more- iframes or embed (javascript)?

I want my website to load as quickly as possible and I need to know whether to take the iframe or embed route.

(This is generally what it's going to look like, but instead of the pics, there will be single pbi visualization:

)

I just want one visualization per picture, ie. one choropleth map or bar chart.  There will be between 2-7 visualizations per page.

Thanks.