This is the most efficient way to max smithing and will be adding time stamps for the most important steps
1:00 Guardian Stones
5:15 Markarth Stables
7:00 Flawless Diamond
9:30 Halted Stream Camp
11:20 Transmute Mineral Ore
12:50 Gold Ore
13:15 Gold Ingot
13:40 Duping
25:00 Smithing
26:20 Smithing 100