The Shaders mod was really made for higher end gaming computers with certain requirements for using it smoothly. I realize it works but it is quite laggy. They usually require an i5 processor or higher with a graphics card, if you have a PC. I am not sure of the requirements for Mac. I have an nVidia GTX 660ti and it runs at around 50 frames on average. I will check again and repost as I have not used the 1.5.2 version yet.
Always make sure you have the latest drivers (314.22 for Nvidia or for AMD it's 13.4) There's a few things you can do to speed things up, lowering draw distance and resolution are the two big ones. The quickest boost to your framerate are draw distance and resolution. Put the game in a window and shrink it until you get the frame rate you want, if the window gets too small, drop the draw distance and then try again. After that you'll have to start losing the pretties. You could turn off waving grass, wheat and trees by going into gbuffers_terrain.vsh and putting // in front of #define WAVING_GRASS #define WAVING_WHEAT #define WAVING_LEAVES #define WAVING_FIRE You can disable POM (parallax occlusion mapping) by putting // in front of #define POM in gbuffers_entities.fsh gbuffers_hand.fsh and gbuffers_terrain.fsh (not really relevant if you're on 1.5.x as there's no normal mapping anyway) You could lower the shadow render distance in composite.fsh by changing the values of SHADOWDISTANCE and SHADOWHPL (make sure they have the same value) While you're in composite.fsh you can reduce the shadow resolution by lowering the value of SHADOW_RES Some people have said that disabling SSAO in composite.fsh helped them a lot, although I only got a couple of extra frames out of it. (you have to comment out // every line with #define SSAO in it)
whenever i try to open or move any of the zips in the shaderpacks folder it says
"jZip could not create the file [The file's location]. Please check and try again."
I've tried re-downloading it, and all sorts of stuff.