Speed Growth in Final Fantasy Tactics was a huge balance issue and general problem for late game mechanics. Late game spells in the original game would take multiple turns to cast and characters could be de-leveled to uncap speed growth.
Utilizing suggestions and systems from throughout the community, Nexus-Studios has dealt with the Speed Growth issue that combines ideas from around the community to create a balanced system which should work from the early to end game and remove player abuse through de-leveling.The following presentation gives a good introduction to speed growth, alternate solutions, and the solution we took to it here.