I am surprised to see people saying the blade speed for wood is too high for aluminum. The blades must be extremely poor quality if you do. We use lennox Bimetal blades, nothing too fancy, and cut up to 5000FPM and even higher at times to cut all grades of aluminum. 6061, 6063, 2024, 7075, 5052, 5083, etc. They all cut fantastic the higher the surface speed, and the relatively inexpensive Lennox blades last seemingly forever. I have run a single blade for probably 40 hours of cutting as fast as I can feed material by hand (probably 150 inch per minute) and it was still cutting great at the end. it was of course a little slower than the beginning, but still very serviceable.
Lennox Diemaster is the blades we use. Our blades are appx $100 each, but they are 19.5 feet long.
Our saw goes much much faster than the average saw and the only reason I dont run it at it's upper limit (15,000 fpm) is because it is hard on the drive belts and I dont want to have to replace them.
Of course once you want to cut anything else, you need to slow the blade down. Most steels should be down around 150 FPM (Feet Per Minute) some a little slower, some can be faster.