01.Introduction: The CPU Monster
Every time a game loads a map, it reads 5,000 files from the disk. The antivirus intercepts each read to check for viruses. This doubles loading times and causes stuttering.
Don't do it Manually.
Voltris Optimizer automates this entire guide and removes Windows delay in seconds.
02.Chapter 1: Configuring Exclusions (The Magic Trick)
Avoiding Useless Scanning
Original games from Steam/Epic are safe. We don't need to scan them constantly.
1. Start > Windows Security > Virus & threat protection.
2. Manage settings > Exclusions > Add or remove exclusions.
3. Add > Folder.
4. Select: C:/Program Files (x86)/Steam/steamapps.
5. Do the same for Epic Games, Battlenet, etc.
Done. Defender will ignore these folders, drastically speeding up loading times.
03.Chapter 2: MsMpEng.exe (Antimalware Service Executable)
If this process is using 30% of your CPU:
It's usually scanning itself or a stuck Windows update.
Add the Defender file itself to the exclusions (Process > MsMpEng.exe) to stop the loop. (Advanced Registry tip, use with care).
04.Chapter 3: Other Antiviruses (Bloatware)
Avast, AVG, McAfee: Uninstall them. Use Revo Uninstaller to remove everything.
They install browser plugins, fake "Game Boosters," and sales pop-ups.
Defender is already Enterprise-level in detection.
A1.Chapter 4: Malwarebytes (The Companion)
Keep Malwarebytes Free installed.
But go to Settings > Security and DISABLE "Start with Windows".
Use it only for manual scans once a month or if you download something suspicious (piracy). Don't leave it running with the game (it eats FPS).
A2.Chapter 5: SmartScreen
"SmartScreen" blocks unknown apps.
For gamers using mods or GitHub tools (like CapFrameX, FanControl), this gets in the way.
You can disable "App & browser control" if you know what you are downloading.
A3.Chapter 6: Controlled Folder Access (Ransomware Protection)
This feature prevents programs from writing to your Documents folder.
Many games save progress there. If this is enabled, the game may not save (Corrupted Save Error).
If you enable it, remember to manually authorize the game executable.
A4.Chapter 7: Core Isolation (VBS/HVCI)
Device Security > Core Isolation > Memory Integrity.
This uses Virtualization to protect the Kernel.
It costs 5% to 10% of FPS in some games.
If you only play and don't access corporate banks on the PC, you can disable it for extra performance.
Chapter 8: False Positives (Trainers/Mods)
If you use Cheat Engine or WeMod in offline games, AV will detect them as HackTools.
They are not viruses, but memory injection tools. You need to allow them on the device.
Chapter 9: AdBlock (The Front Line)
The best antivirus is not clicking the fake green "Download" button.
Use uBlock Origin in Chrome/Edge. it blocks malicious scripts before they download.
Chapter 10: USB Viruses
Disable "AutoRun" (AutoPlay) for USB drives. It's the most common form of offline infection.
Don't do it Manually.
Voltris Optimizer automates this entire guide and removes Windows delay in seconds.
Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
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By following this guide on Gamer Security (2026): Lightweight Defender, you are equipped with the verified technical knowledge to solve this issue with confidence.
If you still have difficulties after following all steps, our expert support team is available for a personalized remote diagnosis. Every system is unique and may require a specific approach.