Minecraft problems

[DragonRider]

By default, Java uses 256mb RAM. There is a way to make this value bigger.

Go to Control Panel > Java
Click on the 3rd tab - Java
Then click View
You will see a smal table.
On the far left there should be a Platform graph, showing 1.7.

Now, lets give Minecraft more memory.
I usualy give it half of my RAM.
Go to the right - to Runtime parameters.
If you want to give it 1gb RAM, type:

-Xmx1024m

Or you can give it 512mb:

-Xmx512m

You get the idea.
This usualy works for me.

Also, on Optifine, lower/turn off all effects and render distance.
Only thing that should be max is the FPS option. (I forgot how it was called).