If you have a bad video card, but 4 gigs of ram or more, this tutorial will bring your fps up to about 80!
First, create a text file and name it "Minecraft.bat" (disable hiding extensions for known file types in your folder options if you cannot create a .bat file)
In the .bat, type this "@ECHO OFF
"C:\Program Files\Java\jre6\bin\javaw.exe" -Xmx6144M -Xms6144M -jar "C:\Users\Skyler\Application Data\.minecraft\minecraft.exe""
Change the directories to match your own, and where it says xmx6144 and xms6144 type a number depending on the amount of RAM you have.
You can find the amount of RAM your computer has in your computer properties
1 Gigabyte = 1024
2 Gigabytes = 2048
3 Gigabytes = 3072
4 Gigabytes = 4096
6 Gigabytes = 6144
8 Gigabytes = 8192
and so on..
I have 8 gigs of RAM, but i'd like to keep 2 gigs free for any background applications.
When you're done, open the .bat, it should open minecraft, if you have any problems quote this post and i'll help you =D
Proof that it works:
You can see that i have 6140 megabytes of memory allocated to minecraft, and im using 1.5 gigs of it