Retro Game Compatibility Fix
Game-specific CPU throttle presets for 200+ classic DOS and Windows games. Find your game, apply the preset, and play at the intended speed.
18 games found
Grim Fandango
1998AdventureLucasArtsDOS/Win95Issue: Runs too fast, characters move at double speed
Fix: Set CPU to 15% speed. Use ScummVM for best results.
Fallout 2
1998RPGBlack IsleWin95/98Issue: Movement and animations run at 2-3x normal speed
Fix: 20% throttle restores correct movement speed. Also try the Fallout 2 Restoration Project mod.
Commandos: Behind Enemy Lines
1998StrategyPyro StudiosWin95/98Issue: Game runs too fast, impossible to manage units
Fix: 25% throttle. Alternatively use DxWnd for compatibility.
Indiana Jones and the Infernal Machine
1999ActionLucasArtsWin98Issue: Physics and movement too fast
Fix: 30% throttle recommended. Run in Win98 compatibility mode.
Jedi Knight: Dark Forces II
1997FPSLucasArtsWin95Issue: Physics glitches, elevator speeds broken
Fix: 20% throttle fixes elevator and physics bugs.
Baldur's Gate
1998RPGBioWareWin95/98Issue: Animations too fast, combat speed broken
Fix: 35% throttle. BGTutu or EasyTutu mods also help.
Diablo
1996Action RPGBlizzardWin95Issue: Game runs at 3-4x speed, unplayable
Fix: 15% throttle. DevilutionX is a better long-term fix.
StarCraft
1998RTSBlizzardWin95/98Issue: Unit movement and build times too fast
Fix: 40% throttle. Modern patches from Blizzard also fix this.
Age of Empires
1997RTSEnsembleWin95/98Issue: Units move too fast, resource gathering broken
Fix: 30% throttle. Age of Empires Definitive Edition is the modern fix.
Quake
1996FPSid SoftwareDOS/Win95Issue: Physics and movement too fast
Fix: 25% throttle. Quakespasm or vkQuake are better alternatives.
Doom / Doom II
1993FPSid SoftwareDOSIssue: Runs at extreme speed, completely unplayable
Fix: 10% throttle. GZDoom or Crispy Doom are the recommended modern ports.
Theme Hospital
1997SimulationBullfrogWin95Issue: Simulation runs too fast, patients walk at sprint speed
Fix: 35% throttle. CorsixTH is an open-source remake.
Dungeon Keeper
1997StrategyBullfrogWin95Issue: Game speed too fast
Fix: 30% throttle. KeeperFX is the recommended modern fix.
Warcraft II
1995RTSBlizzardDOS/Win95Issue: Units move too fast
Fix: 20% throttle. DOSBox also works well for this title.
Caesar III
1998City BuilderSierraWin95/98Issue: Simulation runs too fast
Fix: 35% throttle. Augustus (open-source port) is the modern fix.
Pharaoh
1999City BuilderImpressionsWin98Issue: Walker speeds too fast
Fix: 35% throttle. Pharaoh: A New Era (2023 remake) is the modern solution.
Planescape: Torment
1999RPGBlack IsleWin98Issue: Animations run too fast
Fix: 40% throttle. Enhanced Edition on GOG/Steam is the recommended fix.
Homeworld
1999RTSRelicWin98Issue: Ship movement too fast
Fix: 45% throttle. Homeworld Remastered is the modern fix.
The Retro Gaming CPU Problem Explained
The retro gaming market is valued at $3.8 billion globally in 2025, with 26.7 million active retro gamers in the US alone. A significant portion of these players are running classic DOS and Windows 95/98 games on modern hardware — and running into the CPU speed problem.
Games from this era used CPU cycles directly for timing. A game designed for a 100 MHz Pentium will run 40–50x too fast on a modern 4 GHz CPU. The original CPUKiller software solved this by consuming CPU cycles with a busy-wait loop, and this browser-based version does the same.
For the best long-term experience, consider DOSBox for DOS games, PCem or 86Box for full PC emulation, or the community-maintained ports listed in the fix notes above.