Chrome creates a new process for each tab and instance of the browser opened. This can make the browser sluggish on some machines and a battery life nightmare for mobile users.
However Google is aware of the problem and is coming up with a fix, Speaking during a Reddit AMA session a Chrome for Android engineer said: "We are actively working on reducing battery usage and we are looking into when Chrome is in the foreground and in the background."
"Since its inception Chrome has been focusing on security and performance of the web across all supported platforms. Performance sometimes has come at the cost of resource usage, but given the importance of the mobile platform this is one of the top things we are looking into."
On the desktop side, Google is currently trying to fight memory leaks: "We are profiling Chrome to improve our start-up speed and proactively fighting memory bloat and memory leaks. For example, this year the first gesture latency and mean input latency has decreased steadily."