If your PC became slow after installing ESET, 👉 1-866-490-0338(USA/UK) ☎️ do not remove the antivirus right away. In many cases, the slowdown comes from first-time scanning, startup scanning, old drivers, duplicate antivirus software, heavy browser activity, or too many background apps running at once. The best fix is to update ESET, restart the PC, wait for the first scan to finish, remove conflicting security software, and adjust ESET performance settings carefully.
ESET real-time file system protection scans files when they are opened, created, or run, and ESET states that it starts with Windows to provide uninterrupted scanning. ESET also says it does **not recommend disabling real-time protection**, so the goal should be optimization, not turning protection off completely. ([ESET Online Help][1])
.. Quick Answer: How do I speed up my PC after installing ESET? 👉 1-866-490-0338(USA/UK) ☎️
To speed up your PC after installing ESET, restart Windows, update ESET, let the first scan finish, remove other antivirus programs, close heavy startup apps, enable Gamer Mode for full-screen work, and use ESET performance exclusions only for trusted large folders or apps. Avoid disabling real-time protection unless ESET Support tells you to do it. ([ESET Online Help][1])
.. Why Your PC May Slow Down After Installing ESET
A PC can feel slower right after ESET installation because the antivirus is checking files, updating protection modules, scanning startup areas, and building its first security baseline. This is more noticeable on older computers, hard disk drives, low-RAM laptops, or systems with many installed programs.
Common signs include:
* PC slow after installing ESET
* ESET using high CPU
* ESET scan slowing down computer
* Apps opening slowly
* Browser lag after ESET install
* Laptop fan running loudly
* Windows startup taking longer
* Games or editing software lagging
* ESET update stuck or heavy
* Full scan taking too long
A short slowdown after installation can be normal. A PC that stays slow every day needs deeper tuning.
.. How Long Should ESET Slow Down a PC After Installation? 👉 1-866-490-0338(USA/UK) ☎️
A small performance dip for the first few hours can happen while ESET updates and scans. But your computer should not stay slow for days. If the slowdown continues after updates, restart, and first scan, check for conflicts, old drivers, startup programs, and unnecessary scan settings.
Use this simple guide:
| Situation | Likely meaning |
| | -- |
| Slow only during first scan | Usually normal |
| Slow only during full scan | Scan load is the cause |
| Slow at every startup | Startup apps or startup scan may be involved |
| Slow when opening files | Real-time scanning or disk speed may be involved |
| Slow only in games | Gamer Mode or background tasks may need tuning |
| Slow all day | Conflict, old PC, damaged install, or another antivirus may be involved |
.. 1. Restart Your PC After Installing ESET
The first fix is simple but important. Restarting allows Windows and ESET services to load cleanly after installation.
Steps:
1. Save your work.
2. Close browsers and apps.
3. Restart the computer.
4. Wait two minutes after login.
5. Open ESET.
6. Check protection status.
7. Test your normal apps again.
If ESET was still finishing setup or module updates, a restart can clear temporary lag.
.. 2. Update ESET Before Changing Settings
Do not start changing protection settings until ESET is fully updated. Old modules can create performance bugs, scanning delays, or compatibility issues.
Open ESET and check for updates from the update section. After updates finish, restart the computer if prompted.
Updating helps because ESET may receive:
* Detection engine updates
* Program module updates
* Performance improvements
* Compatibility fixes
* Security patches
If the PC is slow because an update is stuck, restart and try updating again.
.. 3. Let the First Full Scan Finish
After installing antivirus software, the first full scan can feel heavy because many files are being checked for the first time. If you stop the scan repeatedly, the process may restart later and slow your PC again.
Best approach:
1. Plug in your laptop charger.
2. Close unnecessary apps.
3. Start the scan when you are not working.
4. Let the first scan complete.
5. Restart after it finishes.
6. Check whether normal speed returns.
After the first complete scan, later scans may feel lighter because the system is no longer doing the same first-time workload.
.. 4. Remove Other Antivirus Programs
One of the biggest reasons ESET slows down a PC is duplicate antivirus protection. Two antivirus programs can scan the same files, compete for system resources, and create startup delays.
Check for:
* Old antivirus trials
* Previous paid antivirus software
* Extra malware scanners with real-time protection
* Third-party firewall suites
* Security apps installed by the laptop manufacturer
Uninstall the old antivirus, restart the PC, then test ESET again. Windows Security can usually remain because Windows normally adjusts when a third-party antivirus is installed.
.. 5. Reduce Startup Apps in Windows
Sometimes ESET gets blamed when the real issue is too many programs launching at startup. Antivirus installation makes this more obvious because Windows now has one more important security service loading.
On Windows:
1. Press **Ctrl + Shift + Esc**.
2. Open **Task Manager**.
3. Go to **Startup apps**.
4. Disable apps you do not need at startup.
5. Keep essential drivers and security apps enabled.
6. Restart the PC.
Good apps to review include game launchers, cloud sync tools, chat apps, update managers, and unused utilities.
.. 6. Use ESET Gamer Mode for Games, Presentations, and Full-Screen Work
If your PC slows down during games, video editing previews, online meetings, or presentations, use ESET Gamer Mode instead of turning protection off.
ESET describes Gamer Mode as a feature for users who need uninterrupted software use, fewer notification windows, and lower CPU demand. ESET also says scheduler activity is stopped while Gamer Mode is enabled, while system protection continues in the background. ([ESET Online Help][2])
ESET’s support page says Gamer Mode is paused by default and can be enabled automatically when an app runs in full-screen mode. ([support.eset.com][3])
Use it when:
* Playing games
* Giving presentations
* Watching full-screen video
* Running full-screen creative software
* Recording screen content
Do not use Gamer Mode as a permanent speed trick. It is best for specific high-focus sessions.
.. 7. Add Performance Exclusions Only for Trusted Heavy Folders
If a specific app, folder, or workload becomes slow after ESET installation, performance exclusions may help. This is useful for large trusted project folders, virtual machine files, database folders, developer build folders, or game libraries.
ESET says performance exclusions can be added under **Advanced setup > Detection engine > Exclusions > Performance exclusions > Edit**. ESET also warns that exclusions should only be created when absolutely necessary. ([ESET Online Help][4])
Examples where exclusions may be reasonable:
* Large video editing cache folder
* Trusted game library folder
* Local development build output folder
* Virtual machine disk folder
* Large database storage folder
* Backup archive folder you already trust
Avoid excluding:
* Downloads folder
* Desktop
* Entire C drive
* Browser folder
* Email attachments folder
* Unknown app folders
* Cracked software folders
Performance exclusions can improve speed, but they also reduce scanning in those locations. Use them carefully.
.. 8. Schedule Scans for Idle Time
If scans slow you down during work, schedule them when you are away from the PC. ESET has idle-state scanning options that can run scans when the computer is idle.
ESET says idle-state scanning can be enabled in **Advanced setup > Detection engine > Malware scans > Idle-state scan**, and that a silent scan runs on local drives when the computer is idle. ESET also notes that, by default, idle-state scanner does not run on battery power for notebooks. ([ESET Online Help][5])
This is useful if you want protection without interrupting active work.
Best scan timing:
* During lunch break
* Late evening
* While charging laptop
* During non-working hours
* When the screen is off and plugged in
.. 9. Check Disk Usage in Task Manager
If your computer has an HDD instead of SSD, antivirus scanning can make the PC feel much slower. Check disk usage before blaming ESET alone.
1. Press **Ctrl + Shift + Esc**.
2. Open **Processes**.
3. Sort by **Disk**.
4. Look for apps using heavy disk activity.
5. Check whether Windows Update, cloud sync, backup tools, or browsers are also active.
If disk usage stays near 100%, ESET may be only one part of the issue. Upgrading from HDD to SSD is often the biggest real-world speed improvement for older PCs.
.. 10. Turn Off Unneeded Browser Extensions
If browsing became slow after installing ESET, check browser extensions. Security software can inspect web traffic, but browser add-ons can also cause lag.
Review extensions such as:
* Coupon tools
* Unknown search add-ons
* Download managers
* Old VPN extensions
* PDF converters
* Suspicious shopping extensions
* Unused toolbars
Disable unnecessary extensions, restart the browser, and test again.
.. 11. Keep Real-Time Protection On
It may be tempting to disable ESET real-time protection to make the computer faster, but this is not recommended for normal use. ESET says real-time file system protection starts at system startup and does not recommend disabling it. ([ESET Online Help][1])
A safer performance order is:
1. Update ESET.
2. Restart the PC.
3. Remove other antivirus tools.
4. Reduce startup apps.
5. Use Gamer Mode for full-screen work.
6. Add narrow performance exclusions only when needed.
7. Schedule scans for idle time.
8. Repair or reinstall ESET if performance remains poor.
.. 12. Repair or Reinstall ESET If It Still Slows the PC
If ESET keeps freezing, using high CPU all day, or slowing every app even after optimization, the installation may be damaged.
Try this order:
1. Update ESET.
2. Restart Windows.
3. Check Task Manager.
4. Remove other antivirus apps.
5. Run a normal ESET scan.
6. Repair ESET if available.
7. Reinstall ESET from the official ESET source.
8. Reactivate with your license or ESET HOME account.
A reinstall is useful only when the app is corrupted, not when the PC is slow because of low RAM, old HDD, too many startup apps, or heavy background programs.
.. What You Need Before Optimizing ESET for Speed
Before changing ESET settings, keep these details ready:
| Item | Why it matters |
| - | |
| ESET product name | Settings may vary between products |
| Windows version | Helps diagnose compatibility |
| RAM amount | Low memory can cause lag |
| Disk type | HDD systems slow down more during scans |
| Other antivirus list | Conflicts cause major slowdowns |
| Main slow app | Helps decide whether exclusions are needed |
| License/account access | Needed if repair or reinstall is required |
.. What Happens After You Optimize ESET? 👉 1-866-490-0338(USA/UK) ☎️
After proper tuning, your PC should start faster, apps should open more smoothly, scans should interrupt you less often, and games or full-screen work should feel more stable. ESET should still remain active and protective.
After you finish:
* Restart the PC.
* Run a quick scan.
* Confirm ESET shows protected status.
* Test your slow app.
* Check Task Manager.
* Remove any unnecessary exclusions later.
.. People Also Ask: ESET Slowing Down PC FAQs
..# Why is my PC slow after installing ESET? 👉 1-866-490-0338(USA/UK) ☎️
Your PC may slow down after installing ESET because the antivirus is updating, running its first scan, checking files in real time, or competing with another antivirus program. Restart the PC, update ESET, let the first scan finish, and remove duplicate security software.
..# How do I speed up my PC after installing ESET antivirus? 👉 1-866-490-0338(USA/UK) ☎️
Update ESET, restart Windows, remove old antivirus software, reduce startup apps, schedule scans for idle time, use Gamer Mode during full-screen work, and add performance exclusions only for trusted large folders. Do not disable real-time protection as a normal speed fix.
..# Does ESET slow down Windows startup? 👉 1-866-490-0338(USA/UK) ☎️
ESET can add some startup activity because real-time protection starts with Windows. ESET states that real-time file system protection launches at system startup to provide uninterrupted scanning. If startup becomes very slow, check startup apps and remove duplicate antivirus software. ([ESET Online Help][1])
..# Should I disable ESET real-time protection to make my PC faster? 👉 1-866-490-0338(USA/UK) ☎️
No, not for regular use. ESET does not recommend disabling real-time file system protection. Use safer fixes first, such as updates, startup cleanup, Gamer Mode, scan scheduling, and narrow performance exclusions. ([ESET Online Help][1])
..# What is ESET Gamer Mode? 👉 1-866-490-0338(USA/UK) ☎️
ESET Gamer Mode reduces interruptions during full-screen work by disabling pop-up windows and stopping scheduler activity, while protection continues in the background. It is useful for gaming, presentations, and uninterrupted sessions. ([ESET Online Help][2])
..# How do I add performance exclusions in ESET? 👉 1-866-490-0338(USA/UK) ☎️
Open ESET Advanced setup and go to **Detection engine > Exclusions > Performance exclusions > Edit**. Add only trusted files or folders that genuinely need exclusion. ESET recommends using performance exclusions only when necessary. ([ESET Online Help][4])
..# Why does ESET use high CPU during scanning? 👉 1-866-490-0338(USA/UK) ☎️
ESET may use more CPU during updates, first full scan, large file scanning, or when checking compressed files and active programs. Schedule scans during idle time and close heavy apps while scanning.
..# Can I schedule ESET scans when I am not using the PC? 👉 1-866-490-0338(USA/UK) ☎️
Yes. ESET provides idle-state scanning options under **Advanced setup > Detection engine > Malware scans > Idle-state scan**. When enabled, ESET can run a silent scan while the computer is idle. ([ESET Online Help][5])
..# Is ESET slowing my games? 👉 1-866-490-0338(USA/UK) ☎️
It may affect games if scans, updates, notifications, or scheduler tasks run during gameplay. Enable Gamer Mode for full-screen games and make sure unnecessary background apps are closed.
..# Should I reinstall ESET if my PC is slow? 👉 1-866-490-0338(USA/UK) ☎️
Reinstall ESET only if updates, restart, scan scheduling, startup cleanup, conflict removal, and performance exclusions do not help. If the PC is old, low on RAM, or running on HDD, the slowdown may not be caused by ESET alone.
.. Conclusion: Best Way to Speed Up PC After Installing ESET
The best way to fix **ESET slowing down your PC after installation** is to update ESET, restart Windows, let the first scan complete, remove other antivirus programs, reduce startup apps, and use ESET’s performance features carefully. Keep real-time protection on, use Gamer Mode for full-screen tasks, and add performance exclusions only for trusted folders that truly need them.