But seriously- several thing will affect growth rate of those plants:
Lighting- how much/what kind of light/how many hours?
Fertilizers? Unless one is using one of the specialized substrates, then root tabs are about required (at least for the swords).
Carbon source? Plants need a firm of carbon- usually in the form of CO2. If you have relatively low lighting, then fish respirate enough. If lighting is fairly high, then mire is needed- either by CO2 injection, or products like Flourish Excel (the latter won't hurt even in relatively low light).
Are the plants nice and green? If so, they are healthy. I would guess you have fairly low light- as with medium low light, swords will fill a tank in relatively short order given carbon source, ferts, and plenty of light.
Both plants you listed can be fairly fast growing. But it takes llight, ferts, and carbon source to really make them "explode".