When Dark of the Moon launched in 2011, developer High Moon Studios focused exclusively on the and Xbox 360 versions. According to reports from that era, the team felt they lacked the resources to deliver a high-quality PC port within the tight movie-tie-in deadline.
The gamers, meanwhile, were enjoying their new game, with many reporting smooth gameplay and an immersive experience.
Emulators often stutter when loading new effects. A good repack includes a "transferable shader cache" so the game runs smoothly from the first minute.