When i'm playing for 1 minute on my minecraft server.
that is hosted with 4 Gb ram.

my minecraft started to freeze en drop fps. because of a OPEN GL error
the post rendering is taking to long.

my settings are:
music:0.0
sound:0.6056338
invertYMouse:false
mouseSensitivity:0.70422536
fov:0.0
gamma:1.0
viewDistance:1
guiScale:2
particles:1
bobView:false
anaglyph3d:false
advancedOpengl:false
fpsLimit:0
difficulty:2
fancyGraphics:true
ao:true
clouds:false
skin:Default
lastServer:
lang:en_US
chatVisibility:0
chatColors:true
chatLinks:true
chatLinksPrompt:true
chatOpacity:0.7253521
serverTextures:false
snooperEnabled:false
fullscreen:false
enableVsync:true
hideServerAddress:false
advancedItemTooltips:true
pauseOnLostFocus:true
showCape:true
key_key.attack:-100
key_key.use:-99
key_key.forward:17
key_key.left:30
key_key.back:31
key_key.right:32
key_key.jump:57
key_key.sneak:42
key_key.drop:16
key_key.inventory:18
key_key.chat:20
key_key.playerlist:15
key_key.pickItem:-98
key_key.command:53

i get the same issue with advanced open gL on and advanced openGL off.

my system specs:
dxdiag.txt

for my minecraft.bat i use :
"C:\Program Files (x86)\Java\jre7\bin\java.exe" -Xmx1024m -Xms1024m -jar Minecraft.exe