Pretty much any laptop with a high-power processor (HQ series) will perform better when plugged in. You can force them to run at higher performance off the battery (go into Power Settings control panel, select "high performance" mode), but they will burn through a battery in like 20 minutes if you're really pushing them.

Sometimes Ultrabook-style laptops will have a higher boost, but they're often thermally limited anyway so running more power just makes them throttle harder.