CCleaner Pro’s job, done free — with an undo button 
Every tweak shows its risk before you touch it. Every change reverses in one click. The fear paid optimizers sold for is gone.
pick tweak ▸ apply ▸ regret it? ▸ UNDO ✓
optimizerDuck — github.com/itsfatduck/optimizerDuck · portable, open source, no telemetry
- 42 tweaks, 7 shelves — performance, privacy, gaming, power, AI, bloatware, disk cleanup
- Risk rated on every card —
safe · 
caution · 
expert, plain-English description on each - One-click undo — revert any tweak alone or all at once, from local backup files
- Restore-point prompt before the first change lands
- 11.5k stars, GPLv3, Windows 10/11, ARM64 too — download the exe, run, done
The free stack around it — each one covers a job the core skips:
BleachBit — bleachbit.org · deep junk clean with preview before deletion
Winapp2.ini — github.com/MoscaDotTo/Winapp2 · thousands of extra cleaning rules for BleachBit
WinUtil — github.com/ChrisTitusTech/winutil · system repairs, updates, app installs
BCUninstaller — github.com/BCUninstaller/Bulk-Crap-Uninstaller · bulk uninstall + leftover scan
Autoruns — learn.microsoft.com/sysinternals · startup items other tools never show
🔓 The unlock kit — warnings, update walls, fresh ISO, placebo filter
- Unsigned exe warning → right-click the file → Properties → tick Unblock, or run
Unblock-File .\optimizerDuck.exe - Pause Windows updates long-term → github.com/Aetherinox/pause-windows-updates · free, portable
- Fresh PC, already debloated → tiny11builder — github.com/ntdevlabs/tiny11builder · builds a slim Windows 11 ISO, or MicroWin inside WinUtil
- Tweaks that work → updated GPU drivers, XMP/EXPO in BIOS, MSI mode on GPU and network card, high-performance power plan
- Tweaks that don’t → disabling SysMain on an SSD, DNS changes for game latency, manual TRIM — placebo, skip them
- Script readers → privacy.sexy — github.com/undergroundwires/privacy.sexy · shows the exact commands before they run
🧪 The rollback proof — and the one rule
- German magazine connect ran the undo test: all 22 registry values, 3 services and 8 telemetry tasks returned to their exact previous state
- Undo covers settings — deleted files and uninstalled apps come back by reinstall, so a Windows restore point before the first session stays the habit
- One tool, not a stack — pick the core, add BleachBit for junk, run nothing that overlaps
- Download from the official GitHub Releases page only
Speed was never the expensive part. Confidence was.
!