Asynchronous support?

@asterix: AddThis code is designed to maximise efficiency without affecting content load speed. If you are testing with PageSpeed tool, you might see warnings. But be assured that AddThis heavily caches the assets and PageSpeed does the testing ignoring the cached content. Please refer the answer here: https://support.addthis.com/customer/portal/questions/1402678-google-page-speed-warnings

It’s not just the Google PageSpeed value, it’s results (asset load times, priorities and sizes) from tools.pingdom.com reports. If we disable AddThis, we see a significant reduction in page load time.