Crawlers are pretty good with handling JS now a days.
Honestly though, I would not get too concerned with this unless there is a HUGE lag in page load. Instead focus on why people should visit your website. Do you have something on value for them? If you do, I don't think people will mind if your page load in 3 seconds instead of 2.
AddThis and Google Translate should not make your page load time THAT much longer. Have you tried running a few tests to see what the load time difference is? I would use http://webpagetest.org/ to run your tests.