When combining Speed Crystals, I had two Tier 2's, combined them into a single Tier 3, and the total Speed it showed below went from 3 to 2. Before that I had a Tier 2 and two Tier 1's.
So I combined the two Tier 1's, then combined the two Tier 2's. I went from originally a 4x Speed (shown below the squares), to a 3x Speed, to a 2x Speed.
I'm confused. It is better to have multiple Tier 1's? Is the resulting Speed benefit 1.3 + 1.3 = 2.6x Speed? Or is it 30% + 30% = +60% Speed increase?