Nailing down a high-quality mouse sensor is tricky without getting hands-on time with a given mouse. The two key sensor types are "optical" and "laser" sensors, but you can't apply absolutes when judging them. Your best bet is to try out a mouse in person, or to rely on formal reviews like ours, as well as online forums, for the skinny on how a mouse feels in specific play situations.
Prolonged exposure to warm laptops can cause erythema ab igne (EAI)—also called Toasted Skin Syndrome or Granny’s Tartan—a blotchy, chronic skin condition that is in rare cases associated with some cancers. We do not recommend using any gaming laptop on your lap for long periods of time, as the undersides of all the laptops we tested regularly measured over 43 °C (109 °F) (the threshold for EAI) during even short gaming sessions.
In terms of display size, a 15-inch screen is the sweet spot for a gaming laptop. You can buy larger 17-inch displays, but this can jack up the weight to way beyond 5 pounds. We've seen 12-pound "portables" in the gaming sector that will definitely weigh down your backpack. We recommend at least a full HD (1,920-by-1,080-resolution) screen. Larger displays are capable of giving you higher-than-1080p resolutions, but choose wisely, as a resolution of QHD+ (3,200 by 1,800 pixels, and uncommon) or 4K (3,840 by 2,160 pixels, a bit more common) will boost the final cost twice: first for the panel, and second for the higher-quality graphics chip you'll need to drive it to its full potential.
You'll immediately want to buy a gaming mouse; even the nicest touchpads are garbage for gaming. The Logitech G series has been the gold standard for years; Razer makes well-reviewed mice, too. Depending on how hot your laptop gets, you may want a cooling pad, as well. And if you've sprung for a pricier laptop, you may want a second monitor for some games.
Gaming laptops can put a serious dent in your wallet, with some of the fancier models costing upward of $3,000. But who says that the right rig has to cost an arm, a leg and the soul of your firstborn? Fortunately for the fiscally conscious gamer, there are some sub-$1,000 notebooks that can run graphically taxing games like Destiny 2 and Shadow of the Tomb Raider at solid frame rates.