When is happening:
When I load Minecraft game works nicely when I load it a few minutes after my computers boots up, but if I close it and try to relaunch it later I get so much lag that it becomes unresponsive when it gets to the menu screen. It is also using most of my CPU on the reload attempt.
What I tried:
I re-installed java and Minecraft and it did not fix it.
When it did work:
I used to not have this problem. When I did not have this problem I had a graphics card in my computer. It is a low performance graphics card but when I had it I got around 150fps at max graphics settings. Without it I get about 30fps on a lowered graphic settings.
The reason I am not using the graphics is related to my power supply currently not being powerful enough to power it. I bought a new one tonight though so I should be able to use it again soon, and maybe eventually get a better one.
I think with the graphics card in it was powerful enough to run Minecraft even though there was problems if you launched it later, but I never noticed it. Though I am thinking this is probably no the case because I did not notice any large drop in performance int he game when I relaunched it again while I was using the graphics card.
What could be causing this?
I think this might be affecting other java programs but I am not sure of a good way to test this.
That is odd that Minecraft is behaving in this manner. I'm assuming your on Windows, reinstalling both Java and Minecraft didn't work, and I don't think you'll want to try to reinstall the OS for a game. What is weird is, Minecraft runs perfectly when you boot up your computer? I'm not an expert, but have you tried looking into your CPU usage and your RAM? I play Minecraft on my MacBook Pro(MBP) most of the time, and I have it capped. It by default, to my surprise, used up to 4.3GB of my RAM out of the total 8GB I have when I was running a heavy mod (Probably shouldn't have run it lol). I was surprised Minecraft ate that much, so check how many you have before, and after you run Minecraft.
At this point, looking at your situation, that's about all I can say. Now as for testing Java, you can try java based programs or a game called RuneScape, it is based on Java and would probably give you enough for testing, but I still do advise on java based programs. If everything runs smoothly on the Java based program, then it's Minecraft. I do notice that Minecraft got real heavy to run recently. Sorry I wasn't much help.
answered Dec 08 '11 at 11:51
i had a problum somthing like that i am on a 64 bit computer and i had 32 bit java installed sooo i installed the 64 bit java and it seemed to fix it
answered Dec 10 '11 at 23:01