[jitter] Lumakey shader slower than jit.lumakey with noaccel

I'm working through some OpenGL stuff on this machine:
2 X 2Ghz Mac Pro, 1 Gig RAM
OS 10.4.8
NVIDIA GeForce 7300 GT, 256 VRAM

When I load bball.mov and blading.mov into the patches below, I get around 75fps for the GPU version and around double that for the CPU version with noaccel turned on. Apparently upgrading to 10.4.9 improves OpenGL performance on this machine-- as it's a borrowed computer I'm holding off if it's not going to make a difference.

lumakey_CPU

max v2;
#N vpatcher 375 79 898 454;
#P toggle 27 170 15 0;
#P window setfont "Sans Serif" 9.;
#P newex 53 199 29 196617 gate;
#P user jit.fpsgui 53 226 60 196617 0;
#P message 349 204 48 196617 binary 1;
#P flonum 365 157 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 365 176 46 196617 luma \$1;
#P flonum 320 157 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 320 176 37 196617 tol \$1;
#P flonum 239 158 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 239 177 44 196617 fade \$1;
#P message 427 75 27 196617 stop;
#P flonum 455 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 455 75 42 196617 rate \$1;
#P message 395 75 28 196617 read;
#P newex 311 127 144 196617 jit.qt.movie 320 240;
#P newex 239 201 76 196617 prepend param;
#P newex 317 256 32 196617 print;
#P message 168 202 67 196617 getparamlist;
#P newex 21 145 70 196617 jit.window fa;
#P newex 158 279 182 196617 jit.gl.videoplane fa @scale 1.333 1. 1.;
#P newex 21 123 121 196617 jit.gl.render fa @ortho 2;
#P newex 21 79 58 196617 t b b erase;
#P newex 158 229 162 196617 jit.gl.slab fa @file co.lumakey.jxs;
#P message 274 75 27 196617 stop;
#P flonum 302 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 302 75 42 196617 rate \$1;
#P message 242 75 28 196617 read;
#P flonum 62 37 35 9 0.5 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P toggle 21 37 15 0;
#P newex 21 58 51 196617 qmetro 2;
#P newex 158 127 144 196617 jit.qt.movie 320 240;
#P connect 2 0 1 0;
#P connect 1 0 9 0;
#P fasten 9 2 10 0 74 105 26 105;
#P connect 9 0 10 0;
#P connect 30 0 29 0;
#P connect 29 0 28 0;
#P connect 3 0 1 1;
#P connect 0 0 29 1;
#P fasten 9 1 0 0 50 117 163 117;
#P fasten 5 0 0 0 307 117 163 117;
#P fasten 7 0 0 0 279 117 163 117;
#P fasten 4 0 0 0 247 117 163 117;
#P connect 0 0 8 0;
#P fasten 13 0 8 0 173 223 163 223;
#P fasten 15 0 8 0 244 223 163 223;
#P connect 8 0 11 0;
#P connect 22 0 21 0;
#P fasten 25 0 15 0 370 197 244 197;
#P fasten 23 0 15 0 325 197 244 197;
#P connect 21 0 15 0;
#P fasten 27 0 15 0 328 219 328 196;
#P connect 6 0 5 0;
#P connect 16 0 8 1;
#P fasten 9 1 16 0 50 117 316 117;
#P fasten 17 0 16 0 400 117 316 117;
#P fasten 20 0 16 0 432 117 316 117;
#P fasten 18 0 16 0 460 117 316 117;
#P fasten 8 1 14 0 315 251 322 251;
#P connect 24 0 23 0;
#P connect 26 0 25 0;
#P connect 19 0 18 0;
#P pop;

lumakey_GPU

max v2;
#N vpatcher 395 65 918 440;
#P toggle 57 136 15 0;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 57 157 29 196617 gate;
#P message 25 284 55 196617 noaccel \$1;
#P toggle 25 266 15 0;
#P flonum 311 159 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 311 184 39 196617 lum \$1;
#P flonum 398 159 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 398 184 42 196617 fade \$1;
#P flonum 353 159 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 353 184 35 196617 tol \$1;
#P newex 166 232 58 196617 jit.window;
#P newex 184 184 61 196617 jit.lumakey;
#P user jit.fpsgui 57 188 60 196617 0;
#P message 427 75 27 196617 stop;
#P flonum 455 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 455 75 42 196617 rate \$1;
#P message 395 75 28 196617 read;
#P newex 311 127 144 196617 jit.qt.movie 320 240;
#P message 274 75 27 196617 stop;
#P flonum 302 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 302 75 42 196617 rate \$1;
#P message 242 75 28 196617 read;
#P flonum 62 37 35 9 0.5 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P toggle 21 37 15 0;
#P newex 21 58 51 196617 qmetro 2;
#P newex 158 127 144 196617 jit.qt.movie 320 240;
#P connect 2 0 1 0;
#P connect 22 0 23 0;
#P connect 25 0 24 0;
#P connect 24 0 13 0;
#P connect 3 0 1 1;
#P connect 0 0 24 1;
#P connect 1 0 0 0;
#P fasten 4 0 0 0 247 117 163 117;
#P fasten 7 0 0 0 279 117 163 117;
#P fasten 5 0 0 0 307 117 163 117;
#P connect 14 0 15 0;
#P connect 23 0 15 0;
#P connect 0 0 14 0;
#P connect 20 0 14 0;
#P connect 16 0 14 0;
#P connect 18 0 14 0;
#P connect 8 0 14 1;
#P connect 6 0 5 0;
#P fasten 10 0 8 0 460 117 316 117;
#P fasten 12 0 8 0 432 117 316 117;
#P fasten 9 0 8 0 400 117 316 117;
#P connect 1 0 8 0;
#P connect 21 0 20 0;
#P connect 17 0 16 0;
#P connect 19 0 18 0;
#P connect 11 0 10 0;
#P pop;