What Crimson changes, and why.
Each tweak is a documented Windows, driver or background-app setting with a plain-English description, a risk label and an undo. Here's what the app covers.
Ten areas, one goal.
Higher and steadier FPS, lower input delay, and fewer things competing with your game for CPU time.
CPU performance
Lets the processor stay ready instead of saving power between frames.
- High-performance power plan and core parking
- Processor scheduling for foreground games
- CPU-aware guards (for example on AMD X3D processors)
GPU performance
Keeps the graphics card at the right clocks and settings for low-latency play.
- Driver-level low-latency and power settings
- NVIDIA profile tuning (Premium and Ultimate)
- GPU scheduling only where it suits your card
Windows optimization
Turns down Windows features that run in the background during games.
- Game Mode, Game Bar and capture settings
- Visual effects and notifications
- Telemetry and scheduled tasks you don't need
Memory optimization
Reduces memory pressure and stalls on systems that need it.
- Memory-management and paging settings
- Cleaner for temp files and caches
- Guidance for XMP / EXPO in the BIOS guide
Background processes
Fewer apps fighting your game for CPU time.
- Startup app management
- Game Boost: closes background apps while you play, reopens them after (Premium and Ultimate)
- Never touches your game, anti-cheat, drivers or Discord
Input latency
Shortens the path from your click to the frame on screen.
- Timer resolution (Premium and Ultimate)
- Mouse and keyboard input settings
- Game process priority
Network optimization
Steadier connections for online matches.
- Adapter power saving and TCP settings
- Network throttling defaults
- Free Netgraph tool to see ping, jitter and loss live
Driver optimization
Driver settings that matter for games, applied through the driver's own profile system.
- Smart NVIDIA profile matched to your GPU (Ultimate)
- Device power-management settings
- USB and device power-saving settings
Advanced system tweaks
Deeper changes for experienced users. Clearly labelled, never applied silently.
- Maximum FPS mode (Ultimate)
- Guided GPU and CPU tuning (Ultimate)
- Crimson Lab: A/B test a tweak on your own PC (Ultimate)
Fortnite performance
PC-level settings for Fortnite, plus optional presets for the game's settings file.
- Fortnite process and system settings
- Optional performance presets you apply and undo yourself
- No game-file modification, no injection
You always know what you're applying.
Every tweak carries one of these labels in the app.
Recommended
Standard settings with a clear benefit and no known downside on supported hardware. These are what One-Click applies.
Hardware-dependent
Helps on some PCs and not others, so it isn't auto-recommended. Try it, measure with the FPS Test and keep it only if it helps.
Trade-offs explained
Bigger changes for experienced users, each with a written explanation of the trade-off. Never applied automatically.
Every tweak can be undone. Crimson saves your original setting before changing it and makes a restore point before applying in bulk. Turn off a single tweak, or use Restore All to put everything back.
Tools that measure, not guess.
FPS Test
Measure FPS before and after on your own PC, so you know what a change did.
Crimson AI
An offline assistant that explains tweaks, problems and next steps in plain language.
Backup & restore
Restore points, saved originals and Restore All. Plus a cleaner and a BIOS guide.
One-Click Optimizer
Applies the recommended Safe set for your hardware in one step. Reversible like every other change.
Game Boost
One click before you play closes background apps; ending Game Boost brings them back.
Autopilot & profiles
Applies your setup when you start a game and restores it afterwards, with profiles per game.
Maximum FPS
The full-power configuration for players who want every frame, with guided GPU and CPU tuning.
Smart NVIDIA profile
Driver profile settings matched to your GPU, applied through NVIDIA's profile system and reversible.
Crimson Lab
A/B test a tweak: run with and without it and compare your own measured results.
Full plan-by-plan breakdown on the comparison page.
See what it does on your PC.
Free includes the FPS Test, so you can measure before you decide anything.