Portal is a first-person puzzle-platformer from Valve that tasks players with solving increasingly complex test chambers using a portal gun. The gun creates linked entry and exit portals on valid surfaces, letting you manipulate momentum, redirect objects, and navigate the humorous, narrative-driven world of Aperture Science. Most players finish the compact 19-chamber campaign in a single 3–6 hour sitting, but a dedicated speedrunning community treats it as a precision timing game. These runners replay individual segments for world-record times, executing advanced movement tricks that depend on pixel-perfect mouse input, exact portal placement, and consistent visual feedback. In the high-FPS scenario, performance is less about graphical fidelity and more about eliminating every source of delay between intention and result. The Source engine's physics calculations—especially when portals are rapidly swapping an object's velocity—can introduce micro-stutters or variable frame pacing on slower hardware. Speedrunners therefore chase the highest sustainable refresh rates possible so that cursor movement, portal firing, and momentum tricks all feel instantaneous. Common pain points include frame-time spikes during object launches or when the simulation briefly overloads in heavily modded maps. Many newcomers overbuild for visuals or ray tracing, missing the fact that Portal's real competitive demand is CPU responsiveness and rock-solid frame delivery rather than raw polygon pushing. Before choosing a PC for this use case, understand that the game scales extremely well with modern hardware but still leans on single-threaded CPU performance for its core physics loop. Stable high frame rates reduce perceived input lag, tighten timing windows for glitches and skips, and give runners the visual clarity needed to hit sub-second improvements. The right system keeps the entire experience feeling weightless so the only limit is skill, not hardware.