K lets start most of you that have old PC have Lag issues. Well this is the second best solution . the first is to buy a new PC.Most of you download simple texture packs from here but still no efect and you want the default textures or HD
the solution is this: www.minecraftforum.net/topic/249637-172-optifog-and-optimine-hd-c-fps-boost/

Its the best fix of lag ! its caled OptiFog .

it updetes every time minecraft updates !

just download put in minecraft.jar and you are done !

this thing can give up to 30 fps !

wen your done with the instalation start minecraft and go to options>video options>and there you will see alot more options for the video !

you can even make the water lava or fire from animated tho non unimation ! cool huh

no need of textures ;)

if you have ptoblems with the download go here>:adf.ly/21UcT

i hope i help you :)

and sorry im bad at eng :D