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Thank you for your answers, but you didn't quite understand me.
The game runs fine, and the laptop is quite capable.
It easily runs Disciples 3 and HoMM 5.
But in these games, there is an option to enable "vertical synchronization" in the game options, and the LCD display stops "tearing" the image during camera movement and hero movement. This is a known problem with LCD displays; the drivers for this graphics card (Intel GMA X3100) simply don't have the option to enable vertical synchronization, unlike the drivers for Nvidia or Radeon. That's the whole problem: the games don't lag, but the image "tears," and it's not smooth or fluid without vertical synchronization. For example, CRT monitors didn't have this problem at all, even without vertical synchronization enabled, but LCDs are different. In general, there's probably nothing that can be done with HoMM3, since it's an old game.