Have you noticed that your Windows computer is lagging, the fan is making more noise than usual, or you see the CPU, RAM or hard drive running at 100% without really knowing why? It's quite possible that the antivirus is partly to blame. McAfee It's a powerful solution, but if it's not configured properly it can add load to a system that's already running low on resources, especially if you have many programs and services starting up at the same time.
The good news is that you can tweak both McAfee and Windows to achieve a A reasonable balance between safety and performanceThroughout this guide we will see how to prevent antivirus software from becoming a burden, what to do when the computer becomes overloaded for no apparent reason, and how to get the most out of Windows 10 and Windows 11 so that it runs as smoothly as possible.
McAfee and 100% CPU, RAM, or disk usage: what's normal and what's not
It's important to understand that there are times when you see a peak in the 100% processor, memory, or disk usage is completely normalWhen you turn on your computer, Windows starts services, background programs, cloud synchronizations, the antivirus itself… during that time it's normal for everything to be slower and for the system to seem busy with a thousand things at once.
Another common situation is when you have many programs open or a lot of browser tabsEven if you have 8, 12, or even more gigabytes of RAM, if you keep opening tabs or heavy applications, Windows can reach its limit. Some users even see "insufficient memory" warnings. Then, the system is forced to close windows automatically to prevent a major crash.
What's not so normal is that, without opening any heavy applications, the computer freezes on the disk, CPU or memory constantly at 100%If you only have the basics installed and it still happens, there's usually a misconfigured service, an antivirus interfering with Windows itself, or programs that load at startup without you even noticing.
McAfee, specifically, can cause conflicts with Windows 10 and Windows 11Especially on systems that aren't overflowing with resources. In many cases, simply reconfiguring it or replacing it with a lighter alternative is enough to notice a clear improvement.
It's worth remembering that Windows includes its own built-in solution, Microsoft DefenderThis software acts as both an antivirus and anti-Trojan and typically requires less memory and processing power than more demanding security suites. On many home computers, Defender is more than sufficient as long as the user is reasonably careful with what they install and download.
Optimize McAfee so it doesn't slow down Windows
Want to keep using McAfee but avoid it crippling your computer? The key is... adjust background analyses and processes so that they don't overlap with what you're doing.
The first thing to do is check the schedule for full scans. Many users leave the analysis scheduled during hours when they are using the PCThis causes the disk and CPU to run at peak performance just when they need it most. Change the schedule to a time when the computer is on, but you're not working or gaming (for example, during lunch or at night, if you usually leave your PC on).
It's also a good idea to reduce the number of security features you don't use. If you don't use certain extra features, you can disable them from the McAfee settings and free up resources.
Also check that McAfee is not configured to perform a thorough scan each file when opening or saving it in real time on all drives, including external and network drives, if you don't need it. In many cases, it's enough to keep real-time protection active on the system's main routes and leave full scans for specific times.
If you continue to experience crashes despite these adjustments, seriously consider whether it's worth continuing with McAfee. You might prefer... Uninstall it and leave only Windows Defender.which integrates better with the system and usually causes less trouble in terms of stability.
Uninstall McAfee properly and leave the system clean.
If you decide to get rid of McAfee, simply deleting it from the control panel isn't enough, because it often leaves lingering effects. remains in the registry, services, and residual files that keep loading at startup or interfering with Windows.
The most effective procedure is to use the official uninstall tool provided by the developer. This utility tracks down and removes configurations, services, and registry entries that the standard uninstaller doesn't always delete.
First, uninstall McAfee from the Windows app options, just like you would with any other program. Then, download and run the McAfee's dedicated cleaning tool (usually known as “McAfee Removal Tool” or similar) following the manufacturer's step-by-step instructions.
During the process, your system may prompt you to restart one or more times. It's important to allow these restarts to ensure all components are properly removed. Once the process is complete, Windows will be free of antivirus remnants and ready to use only Defender or another lighter solution that won't significantly impact performance.
Once your computer is clean, it's a good idea to check that Windows Defender has been automatically activated (normal when there is no other antivirus installed) and review its settings to ensure that it offers the level of protection you need without adding excessive burden.
Windows clean boot: detect software conflicts
If, even without McAfee or with it properly configured, the computer continues to behave strangely, you can resort to a Windows clean bootThis method causes the system to start with only the strictly necessary drivers and services, leaving out anything that might be causing conflicts.
A clean boot is not the same as booting into safe mode, but the idea is similar: the system starts with a minimum set of background programs so you can check if a problem is caused by a third-party application, add-on, or service that is not part of Windows.
The procedure recommended by Microsoft involves using the system configuration tool (msconfig) to disable all non-essential services (except those from Microsoft) and disable startup programs. After applying the changes and restarting, you will have a cleaner testing environmentThis makes it easier to see if the problem persists.
If a clean boot resolves the issue, you know the problem lies with a service or program you had disabled. From there, you can proceed to troubleshoot. reactivating services and programs little by little until you pinpoint the source of the CPU, RAM, or disk usage spikes. It's a somewhat cumbersome method, but very effective for catching the culprits.
Microsoft documents this process in considerable detail in its official support materials. It includes specific instructions for selecting and deselecting services, and warnings against modifying critical system components without fully understanding what you're doing.
Keys to optimizing Windows 10 and Windows 11 without losing your mind
Beyond antivirus software, there are a number of internal Windows settings that make a difference. Don't expect miracles (a ten-year-old laptop isn't going to magically transform into a gaming machine), but with a combination of Cleaning, uninstallation and minor touch-ups You can gain fluency and stability.
The first step is to have your operating system and drivers updated. From the section on Windows Update in the settingsIn addition to regular updates, it is recommended to check the advanced options and go to the optional updates section to install newer drivers that affect components such as the graphics card, network adapter, or audio.
Don't forget the apps either. We often install programs from the Microsoft Store and leave them there untouched for years. Go to the store and check that the apps you use frequently are up to date. New versions usually include updates. performance improvements and bug fixes that prevent silly blockages.
A good starting point is to uninstall all the programs you don't use. From Settings, in the Applications section, you can see a list of what you have installed and eliminate everything you don't needIf something doesn't appear on that list, resort to the classic Control Panel and the "Uninstall a program" option to hunt down older software.
By cleaning up your application catalog, you not only gain disk space, but you also reduce the number of applications you need to install. background processes that run when the system starts and associated services that consume resources even if you don't see them.
Programs at startup and apps running in the background
One of the main reasons why Windows takes forever to start up is having too many applications configured to start automaticallySome are necessary (sound drivers, touchpad utilities, cloud syncing that you actually use), but others are pure dead weight.
To see what's going on, open Task Manager (Ctrl + Alt + Delete and choose "Task Manager") and go to the section of Applications on startupThere you will see the complete list of what is launched with the system, along with a column indicating the impact they have on startup time.
The idea is to disable anything that has a medium or high impact and isn't truly essential for your daily use. For example, many launchers, updaters, and small utilities don't need to start with Windows; you can Disable them and only open them when you need them..
In addition to startup programs, it's a good idea to monitor apps running in the background. From Settings, in the Applications section, you can open the list of installed apps, right-click on each one, and go to [the relevant settings/options]. AdvancedThere you will find the permissions to run in the background, and you can set many of them to "Never" without losing anything important.
However, be careful with messaging apps, file syncing apps, or any apps that need to be constantly running to function. If you block them from running in the background, They will only work while you have them open.It may not be what you want for communications or automatic backups.
Switch out resource-intensive apps, clean up your desktop, and free up space.
Another simple lever to gain performance is to replace especially heavy applications for lighter alternatives. A typical example is the browser: Chrome is known for devouring memory and resources, so if your computer is struggling, it might be a good idea to try Firefox or other lighter browsers.
The same applies to image editors, office suites, and media players. Sometimes, using open-source alternatives or simpler tools offers a triple benefit: less resource consumption and fewer background processes. But above all, lower risk of conflicts with the system or with the antivirus.
It also helps to have a tidy desktop. It might sound obsessive, but Windows has to Load all icons, shortcuts, files, and folders Look at what's on your desktop every time you log in. If you have dozens of items, it's noticeable. Try to keep it clean and group what you really need into a single folder.
On the other hand, a full hard drive is a clear enemy of performance. Windows 11 includes a feature to Cleaning recommendations within the Storage section (in the System category of the settings) that helps you clean up the trash, large folders, and temporary files that no longer make sense to keep.
Taking a few minutes to review these recommendations and deleting anything unnecessary can make all the difference. Especially if you have an SSD with limited free space. A comfortable margin of available space improves flow and extends the unit's lifespan, which is especially relevant for laptops.
Notifications, game mode, and power settings
The Windows notification system, along with browser alerts and alerts from some applications, can become a authentic Christmas tree which, in addition to distracting you, consumes resources and keeps processes active unnecessarily.
In the settings, under System, you have the Notifications section, where you can deactivate the ones you don't consider important and limit unhelpful suggestions and notifications. It's also advisable to review your browser notifications (for example, those in Chrome). Many websites sneak in with permissions to send you notifications that offer no benefit.
If you play on PC, you'll want to activate the Windows 11 Game ModeThis mode pauses certain Windows Update tasks (such as disk installations and restart notifications), reduces background activity, and optimizes resource allocation to games when they are in the foreground.
You can activate it from the Gaming section in settings. Once activated, Game Mode will automatically kick in when you launch a compatible title, helping to Improve frame rate and stability by avoiding unnecessary interruptions.
Regarding power plans, many laptops come configured with a balanced profile that prioritizes battery life over raw performance. From the Control Panel, under Power Options (within Hardware and Sound), you can switch to the plan of Maximum performance If what you're interested in is getting the most out of the machine, even if that means the battery lasts less time.
This change is especially noticeable when gaming, editing video, or working with demanding applications. However, if you're going to be using your laptop unplugged for extended periods, you might prefer to stick with the balanced plan and only activate high-performance mode when a power outlet is nearby.
Visual effects, data transmission, and minor performance adjustments
Windows incorporates a series of visual effects (animations, transparencies, shadows) that make everything look more attractive, but which have a cost in terms of graphics and CPU consumptionEspecially on older computers or those with very basic hardware.
In the Accessibility settings, you can find several checkboxes related to these effects and disable them. Doing so will make windows appear and disappear more abruptly, without as much smoothness, but the system still feels more responsive. faster responsebecause there is less graphical load.
Windows 11 is also quite talkative with its servers. It collects diagnostic data, application usage, typing and voice habits, and uses that information to, in theory, improve the user experience. Many of these features reside in the section of Privacy & Security, divided into sections such as General, Voice, Handwriting and typing customization, or Diagnosis and feedback.
Disabling the sending of optional diagnostics, application launch tracking, or personalized suggestions not only reduces the amount of data leaving your PC, but also It cuts off processes that work in the backgroundThese are minor adjustments that do not critically affect security, but they do help to refine performance.
There's also a slightly more hidden setting that lets you fine-tune Windows for optimal overall performance. If you go to System, then System Information, and from there to... Advanced System SettingsThe System Properties window will open. On the Advanced tab, within the Performance section, you will find a Settings button.
In the new window, on the Visual Effects tab, you can select the option Adjust for best performanceThis disables most animations and graphical embellishments, resulting in lower system resource consumption and improved fluidity. In return, the interface appears more understated, but for many users, this more than compensates for the change.
Wallpapers, taskbar, and external tools
Although it may seem like a minor detail, using animated wallpapers or constantly changing carousels This means extra work for the system: it has to manage animations, transitions, and periodic changes. And that makes a difference on limited equipment.
If you need to squeeze out a few extra performance points, try using a very simple static background (a solid color or a light image). This won't double your computer's speed, but it will help things run a little smoother. lighter. Without overloading the GPU or processor with cosmetic tasks.
The Windows 11 taskbar also has elements you can disable if you don't use them. From Settings, under Personalization, in the Taskbar section, you can hide buttons like the standalone search bar, widgets, or the built-in chat app if you don't use them. Every thing you remove is one less process. a little bit of memory that you release.
If you prefer not to mess with internal settings or tinker with the registry, there are third-party programs to optimize Windows. Many are not recommended, but there are options. open source like Optimizer (available on GitHub) that allow you to centrally review and modify Windows services, telemetry, Cortana, updates, and more.
These types of tools typically group dozens of settings into a single interface. From optimizing your network and disabling fax and printing services you don't use, to activating a more aggressive game mode, or remove native Windows apps that you never open. It's best to use them carefully, reading what each switch does, because some options could disable functions you do need.
The advantage is that almost everything can be reverted from within the application itself. So, if you notice that something stops working as expected, you can reactivate the specific feature without having to restore the entire system.
When is it advisable to reset your PC and start from scratch?
If after adjusting McAfee, cleaning programs, optimizing startup, checking visual effects, and playing with power options, your PC is still running terribly, you may have a problem with your PC. deeper problems with configuration, drivers, or remnants of old software that it's no longer worth continuing to patch things up.
In those cases, the last resort is to resort to the option of reset Windows to factory settingsThis function erases your files, removes all applications, and returns the operating system to a state similar to a fresh installation, which usually resolves persistent errors, rare conflicts, and hard-to-diagnose crashes.
Before you begin, it's essential to back up all your documents, photos, videos, and any other content you don't want to lose. You can use the cloud, an external hard drive, or a large USB flash drive, but be sure to thoroughly check your user folders (Desktop, Documents, Downloads, Pictures, etc.) to ensure you don't forget anything important.
After the reset, you will need to Reinstall the applications you really needTake this as an opportunity to avoid overloading your system again. Only install what you'll actually use and avoid duplicating programs with identical functions. Above all, be disciplined when testing new software.
Organizing your computer properly after this clean slate, choosing an antivirus that doesn't overuse resources, and applying the optimization tricks we've discussed (from controlling startup to reducing visual effects) will help you enjoy a better experience. much smoother and more stable experience For a long time. Without having to deal with daily 100% spikes, sudden freezes, or constant disk noise.