huldu

I have the same problem. Worked in .499 and earlier but .506+ started showing that error every time I created a new world. <edit> For me it's OptiFine_1.4.6_HD_U_B5 causing the crash, works fine without it.

Vanilla minecraft 1.4.6 with forge .473 runs fine. Just like 1.4.5 did filled with mods. However once I start add some mods... I keep seeing at times "can't keep up", the server lvl0 tick around 40-50ms with me on the server(alone). Once I disconnect the ms drops down to around 7-8(I assume the chunk is still loaded for a little bit). Then after a few minutes it's down at 0.660ms. But the worst part is the block flickering going on. Especially when you're digging downwards with you on the block. What's wrong? What has *changed* since 1.4.5 that made a HUGE performance drop all of the sudden? Started up my old 1.4.5 server(45-50ish mods, ie ic2, bc, forestry, railcraft and so forth) and joined in, the lvl0 tick was around 15-20ms. <edit> Forgot to mention that's with a CLEAN newly created world, each time. Anyways, the computer running the server is a 2.7ghz dual core with 2gb ram. The server only runs a minecraft server, nothing else.

Not sure what you mean? The client seems to run fine as far as I can tell at least. But since you're the only one responding I suspect the issue is a little bit more complicated. I'm going to download a new minecraft_server.jar and add inject .473 to it and make it run a pure vanilla server and see if the problem is still there. Mods running: RP2, BC, Forestry, Computercraft, Factorization and Thermal Expansion. It's quite bare due to mods not being updated or rather, now most are, but when I had the server going those were the addons.

Using the minecraft_server.jar from minecraft.net, I assume it's 1.4.6. I inject forge 473 into it and and some mods for 1.4.6. What I first noticed was some block flickering going on every now and then but mostly a lot of "Can't keep up!". I barely ever saw any of those in 1.4.5 now they appear way too often. This might not even have anything to do with forge and could be a mod or just something with the minecraft server jar. Just wondering if anyone else noticed this. My server ran 1.4.5 perfectly fine, just me playing on it. Something just isn't right with the 1.4.6 server. But anyways, maybe someone knows what might cause the problem.

Minecraft crashed, just randomly, with this error: The thing is, it doesn't show what mod caused it. I've run for several days without any problems and just out of the blue that error popped up. I installed forge .426 last night. <edit> Just watched the crashlog and this looks like optifine v4 caused. I've seen this before.