Mouse Movement Lag Issue When Running Heroes of Might and Magic III in Windows 98

[gaoyimin1980]

I encountered a mouse-related issue when running Heroes of Might and Magic III after entering Windows 98. The issue is described as follows: once I enter Windows 98, the mouse works perfectly fine — smooth and responsive. However, after launching Heroes of Might and Magic III, the mouse becomes laggy, and its movement feels noticeably choppy. Meanwhile, the game itself runs normally, and the problem only affects the mouse. This becomes especially obvious when the mouse moves over map structures with visual effects. The same issue also appears in some other games. Could you please check whether the mouse rendering might be affected by the game’s active sprite layers, causing frame loss or slowdowns?