Jenny,
The problem expressed still needs to be addressed. Our site performance and metrics have all taken a severe hit with load times going from 1.7 to nearly 9s after integrating Wordpress with Hubspot. The lag is due to the Hubspot as expressed by the other uses in this thread.
The user experience is severely impacted as the calls to hubspot are causing the interactive elements of the site to not load until after finalizing the api calls to hubspot. Hence the user must wait nearly 10 seconds on a fast connection to interact with the site.
Further, the article you referenced deals more with hosting on hubspot and not wordpress.
I hope you can see the urgency in getting this resolved and let us know what the steps are for remedy.
Thanks!