Why does the fast-growing Lagerstroemia speciosa grow faster than the ordinary Lagerstroemia speciosa?

I observed it at the base of Jiangxi Sannong Company. Personally, I think the main reason for the rapid growth of fast-growing Lagerstroemia indica is its leaves, which are as big as cigarette cases. It is the largest variety of Lagerstroemia indica at present, with full photosynthesis, followed by strong branches and sufficient relative nutrient supply. Many characteristics determine its perfect performance.