Hi, and I have just updated to 1.3.1. Before this I was on 1.2.5, and got around, 30 FPS on Far Render, Fast Graphics, Clouds On etc. Now on 1.3.1, I am on tiny render, fast graphics, clouds off, smooth lighting off, etc etc., and i am getting 3 FPS?!?!?! If anyone knows a way to fix this, please let me know. -Thanks, Nicos.
Something similar happened to me but it was a lot less dramatic. I went from 26 FPS to 19 FPS. Both times i was in tiny, SL off, graphics fast, particles minimum, powersaver, etc. I too am trying to find a fix and will notify you when i do.
Threads like this are pointless without posting the following information:
System hardware specs.
You need to say if you're using 32 or 64 bit OS, if it's Windows then which version of Windows, as well as 32 or 64 bit Java. You need to at least post how much RAM your system has and the make and model of video card, and what type of CPU your system has (single core, dual, quad, speed, etc.)
You should also make a backup of your minecraft directory, then completely delete it and reinstall with NO mods, texture packs, etc. and see if the problem still happens. Also, be sure you check for any driver updates for your video card and install them.
If enough people provide the information, then it will help Mojang fix the issues faster. Simply saying "laaaag I hate it FIX IT FIX IT" doesn't do anybody any good at all.