It used visitors ' computers to perform computationally - intensive calculations , potentially slowing their computer 's performance and its reducing battery life or consuming their electricity .
The Register estimated that the code was active in BroswseAloud for up to thirteen hours .
The Register used visitors ' computers to perform computationally - intensive calculations , potentially slowing their computer 's performance and its reducing battery life or consuming their electricity .
The Register estimated that the code was active in BroswseAloud for up to thirteen hours .