As solute particle size increases, does the rate of dissolving increase, decrease, or stay the same?

As the particle size of the solute increases, the rate of dissolving will remain the same, because particle size is in-proportionate. It is true that it is less likely for larger particles to be soluble, but speed and the ability to even go through the reaction are different. The rate of dissolving is based upon the temperature and ratio of concentration between the solvent and solute, as well as pressure.