Shareaholic make site slow

My Site is http://thebeautifulmindfoundation.org/ and i have installed Shareaholic plugin that is making my site slow and showing a large number of broken link http://tools.pingdom.com/fpt/#!/I4eCs/http://thebeautifulmindfoundation.org/

i dont know when that have too much request. please help me to resolve this issue.

thanks