Hangouts slows down my 15' i7 retina macbook.. I can play 3d games, edit 1080p video and browse with over 100 tabs open... but google hangouts will slow me down

Hangouts slows down my 15' i7 retina macbook.. I can play 3d games, edit 1080p video and browse with over 100 tabs open... but google hangouts will slow me down to a halt.