I play Minecraft on an iMac. It is usually runs very smoothly, with no lag, even on packed servers. But in every snapshot since 1.7.4, the game has been lagging every time I look around. I have put the graphic setting on the lowest, but it still happens. I normally play with all the graphics at their best, and it is usually fine, but not for these snapshots. Even when I am not running any other apps, it still is laggy. I don't know what to do...
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Me and my friend are having the same issue. When I create a 1.7.4 server everything runs smoothly and good. When it's the new snapshot (any since 1.7.4) we get lag. Sometimes it gets to the point where the game is unplayable. The lag occurs on single player also. We think that it also might get worse when it starts to rain but we're not sure.
I am pretty sure my machine is capable of running MC with no performance related lag since it is powerful enough (it's Lenovo y500 with SLI). Moreover the difference between experiences playing 1.7.4 and the snapshot is clearly visible.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
minecraft/crash-reports/crash-<DATE>-client.txt
) here.