Do you mean overload to your senses? I always close most of my tabs. My policy is that if you don't bookmark, you don't care enough. Same goes for my local data. If I don't remember what's on my disk, or haven't backed it up periodically, I don't care about what's on it.
If you mean about RAM usage: https://chromewebstore.google.com/detail/tab-suspender/fiabc... is a good extension.