Fallout 4 is a single-player open-world action RPG set in a post-apocalyptic Commonwealth full of ruined cities, irradiated wilderness, and player-controlled settlements. Players spend dozens or hundreds of hours scavenging, completing faction quests, building elaborate outposts with hundreds of placeable objects, and engaging in real-time or V.A.T.S. combat. On PC the game is most often experienced through extended immersive sessions that frequently include community mods ranging from texture overhauls and ENBs to new quests, NPC overhauls, and performance patches. The practical performance demands come from the aging Creation Engine's tendency to create CPU-bound scenes when many NPCs, scripted objects, and player-built structures occupy the same cell. Dense urban areas like Diamond City or heavily developed settlements can cause noticeable stuttering and inconsistent frame pacing if the processor lacks sufficient cores and cache to handle draw calls and AI routines. Mods amplify these loads by adding higher-resolution assets, advanced lighting, and extra scripting, while fast storage helps shrink long world-cell loading pauses that break immersion during exploration. Common pain points include hitching when entering populated towns, physics glitches at higher frame rates without community fixes, and crashes triggered by mod conflicts on systems with insufficient memory bandwidth or slow storage. Many players initially focus only on GPU power for prettier visuals and overlook the CPU, only to find that even a strong graphics card cannot prevent stutters in crowded areas. Before choosing a PC it is important to understand that a well-balanced system emphasizing CPU strength, fast RAM, and responsive storage will deliver a far more consistent experience than one that chases maximum resolution or ray tracing the engine was never designed for.