I was given this plant and when it was given to me it already had the first leaves already grown.
I’ve had the plant for about a 2 months and nothing has changed. Currently using Miracle Grow potting mix as the soil.
If you want it to grow faster (and with more branches), you can keep it outdoors for the summer. I have noticed that when you put a yucca outdoors in summer, full sun and rain once in a while will stimulate branching. Of course you'll have to let the plant acclimate first, by putting it in the shade first and slowly increase the number of hours of full sunlight. Also be sure you have good drainage, so a container with holes. Furthermore, you can give it some fertilizer to stimulate more growth.