I currently have a desktop computer with 16 GBs of ram (14 of which are allocated to java and Minecraft) and run Minecraft with Optifine installed, fast graphics, short render distance, and smooth lighting off yet I get 15 FPS. I've looked at numerous tutorials on how to improve it but nothing seems to work.
Allocating more RAM to Minecraft often does more harm than good, and you're not running any resource-demanding mods. Assuming you're using the new launcher, edit the profile you have for 1.5.2, tick the JVM Arguments box and replace whatever's in the box with the following:
-Xmx512M
This will assign 512MB of RAM, which is sufficient for Minecraft to run.
If you're using a batch file to run Minecraft, use the above -Xmx512M in your java command.
14 GB of RAM is a bit too much. Try a simple two, three, maybe four GB. Allocating more RAM to Minecraft doesn't necessarily mean it will start running better. Your actual system needs RAM to run other things as well, and if the computer doesn't have enough RAM to use for it's system then more stress will be put on it and everything will slow down, not just Minecraft.
OptiFine isn't out for Minecraft 1.6.1 yet, so I'm assuming you're still using Minecraft 1.5.2. OptiFine will be updated very soon, as it is currently at 95%. I suggest you delete your ".minecraft" folder (backup your worlds if necessary), re-install the whole thing, install OptiFine for 1.6.1 and place your worlds into your new ".minecraft" folder. This should hopefully help a bit with your issue.
If none of the above helped, try restarting your computer occasionally if you don't already. Hope I helped!
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This will assign 512MB of RAM, which is sufficient for Minecraft to run.
If you're using a batch file to run Minecraft, use the above -Xmx512M in your java command.
Stu
OptiFine isn't out for Minecraft 1.6.1 yet, so I'm assuming you're still using Minecraft 1.5.2. OptiFine will be updated very soon, as it is currently at 95%. I suggest you delete your ".minecraft" folder (backup your worlds if necessary), re-install the whole thing, install OptiFine for 1.6.1 and place your worlds into your new ".minecraft" folder. This should hopefully help a bit with your issue.
If none of the above helped, try restarting your computer occasionally if you don't already. Hope I helped!