WPML and Login with Google?

I am currently using the native WordPress comments with Jetpack added on top. Jetpack can add a bit of a weight to the pageload so I don’t mind switching it off and trying something new like this.

My understanding is that this is basically WordPress comments that load up quickly and with its own spam checker (so I can also disable Akismet?) If that’s the case, does this work well with WPML as my website is in English and Arabic. Also, can it allow to login using Google? And finally, if I replace this, can it also remove Gravatars? That also seem to use system resources.