google analytics – Could a slow website cause visitors from a Facebook ads campaign to bounce?

I have a website with traffic problems.
The web site sells a product in Spanish.

I recently created a Facebook ads campaign,
and it got 96 visits.
But Google Analytics only registered 9 visits.
I think my website could be slow and people are bouncing. Could this be the case?

I am using WordPress and the Profitbuiler plugin to create the page.