HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

In the latest update, it was recommended to set the Sys.CPU.ReduceUsage parameter to 2. After experimenting with it, I found that setting it to 1 or 2 does reduce the CPU load significantly, but it also causes slight slowdowns on the map and serious lag in the castle, especially noticeable when dividing troops. I reverted to Sys.CPU.ReduceUsage = 0.