Computer maker Lenovo Group Ltd. has agreed to chip in $7.3 million to settle claims related to adware that came preinstalled on certain models of its laptops, which customers alleged slowed performance and left their machines vulnerable to hackers.

The proposed deal, announced in court filings Wednesday from plaintiffs lawyers at Pritzker Levine; Cotchett, Pitre & McCarthy; and Girard Gibbs, comes after three years of litigation and more than two years after co-defendant Superfish Inc., the maker of the adware, agreed to pay plaintiffs $1 million.