Forza 4 developer Turn 10 has announced that the excellent Xbox 360 racing title has received a substantial game update - the headline feature being a fix that should resolve issues users have experienced that resulted in online lobbies crashing.

"Essentially what was happening was a slow memory leak when using liveried cars and jumping between lobbies," said Forza 4 creative director Dan Greenawalt on the official website.

"The leak was only happening when players driving liveried cars would join or leave lobbies at precisely the right moment during the loading of a race. The leak occurred on all boxes even if the player didn't have a custom livery, but it was exceedingly small. As the leak got worse over the course of a player's session, it would cause the box to crash.

"This resulted in longer load times for everyone else in the lobby with that player as his crashed box timed-out. Unfortunately, the problem was made worse when players would go from one lobby to the next after becoming impatient with loading times, thus essentially 'spreading' the memory leak from one lobby to the next."

According to Greenawalt the fix took weeks to fix due to the difficulty the studio experienced in trying to reproduce the bug during testing.

As well as fixing online lobbies, the update also raises the level cap from 150 to 999, tweaks the performance index of 38 cars, and sorts out bug that caused slow menu navigation.

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