Yeah they put the slow flakes out...
Seriously, I used to work in a tune shop. Base structure (the tiny grooves on the bottom) has as much to do with how fast you go as does wax formula. And way more than the snow itself. Wet snow needs deep base structure (so you don't suction down like a wet glass on a smooth table), dry snow works better with smoother structure. Cold snow - harder wax so the sharp crystals don't stick into it, warm - softer so that the wax actually lubricates. A lot of people hot wax and don't even brush the wax out of the structure, and leave a glass-smooth finish on the bottom with no structure at all.
Multiply about 10 different base structure patterns (and 100's of slight variations) by the 100's of different wax formulations (and possibly a base + mid + top coat setup), and you'll understand why high performance ski tuning still isn't an exact science. In my opinion, a good tuner can make your setup universal enough to work well in about 75% of the conditions you see. Getting any better than that requires either luck, or a whole lot of time and tweaking (and $$).
Blaming the snow is like wearing a speedo in january, and blaming the weather for your shrinkage . If you're going slow, it's probably your gear, not the snow.