1.6.1 Launcher Not playable Fps Too Low

Hi the new minecraft 1.6.1 update slows my fps and many other players of the server i play with a very large community. Mine and everyone elses fps is hardly playable when before the new launcher we had no difficultys.

My Fps before new launcher: 60-80 'Easily Handles'
My Fps using new launcher: 4-9 '100% not playable'

On a singleplayer flat world i reach a max of 20 whihc before i would get a max of 140 for flat worlds.

Needs to be fixed or an alternative luncher for people who do not have $1000-$3000 pc's.

I can not play and moderate my server no longer as i can barely type.

All these fps measures are with all settings on lowest. i have played minecraft for just under 2 years and have played everyday since then and this is disapointing.