you could try disabling VBO in preferences, graphics, hardware, and you could also try to disable http-get for textures in Advanced menu, debug settings, ImagePipelineUseHTTP (and set to FALSE), which I think you already did though in Phoenix if I read that correctly.
Actually doing this tweaked my FPS to it's normal rate and I can somewhat interact again with a bit more ease and not so much terrible lag between typing. I went back to V2 I love my saved outfits feature. The only trouble now is my frames dropping back to the 10-15 range with a possible cause stating too many images in memory. Is there anything else that may help this a tad more? Getting this handled would push me well above normal I imagine and thank you guys so very much for giving me back some SL freedom! *BIG HUGS*