In 4.7.13 there is a strange delay in loading the JS - detected by the 3rd party - Recaptcha JS.
In the analysis, there are 3 requests for the JS recaptcha (the same link from gstatic com) at each page reload.
Here is an example from your site - a test on the registration page.

It is the same in all the sites, for test I visited, including and my site.
TBT time increases by more than a second and a half, and Reduce unused JavaScript time by more than 3.5 seconds.
Please check and fix this issue...

There isn't really much we can do about that, honestly. All of those are being loaded directly by ReCAPTCHA itself, rather than the software.

 

There isn't really much we can do about that, honestly. All of those are being loaded directly by ReCAPTCHA itself, rather than the software.

It's strange why there is a triple request - it increases delays.

I had to shut off guest commenting on my articles do to this issue...it was causing a huge delay on very single article page.

Is there a reason that Captcha needs to load first on every single page when guest posting is allowed? Since only 1/200 people post a comment on my articles that is 199 times Captcha did not need to load at all. Why not only load Captcha when people click on the comment field?

I would load it on the registration page rather than the editor/topic page. 

 

I shut this setting off and it seems to have helped solve the issue. Captcha gets loaded after, on the registration page for post before register.