Apparent latency problems in Left 4 Dead 2 have now been fixed with a massive server upgrade , Valve says.

"We have upgraded our network infrastructure to better accommodate the huge response to L4D2," said a post on the game’s official blog.

"360 players will now have lag-free servers. We've also added more dedicated servers. We will continue to monitor the situation and add resources as needed."

Left 4 Dead 2 is out now on Xbox 360 and PC, if you want to know a bit more about what to expect then have a look at the game’s hub right here at Prima.