Why Windows Update Slows Your PC (And What to Do About It)

Quick Answers

Common questions answered at a glance

Why does Windows Update slow down my PC?

Windows Update loads the files, installs the files, and organizes your system in the background. While this is occurring, it may consume 10-30% of your processor and a lot of your internet bandwidth. Also, you may experience some slowdowns shortly after an update occurs since Windows rebuilds search indexes and optimizes components behind the scenes.

Do I need to turn off Windows Update?

How do I stop Windows Update from using such a large portion of my processor?

Can I pause Windows Update?

Will disabling Windows Update destroy my PC?

Windows Update slowing down your PC can be frustrating. You are in the middle of a game or a work session and your processor is at 30%, your PC is crawling, or it will simply shut down at random. In this guide you will find out why Windows Update slows down your PC, whether you should disable it (the answer is no) and how to set the update time so that it happens when you want it to.Plain language; no exaggeration; honest answers and practical solutions.

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How Windows Update operates

What it really does

Windows Update supplies you with 3 things: security patches, feature updates and driver updates. Security patches address the vulnerabilities that hackers exploit. Feature updates provide new capabilities. Driver updates ensure that your hardware operates properly.Once a Windows Update is available, Windows downloads it in the background, stages it for installation, and installs it — occasionally resulting in a reboot. The whole process is intended to occur automatically. Unfortunately, “automatically” frequently equates to “at the worst possible time.”

Why it uses resources

During a Windows Update, Windows executes a background task called TiWorker.exe — the Windows Modules Installer Worker. It unpacks and installs the update files using 10-30% of your processor and a considerable amount of disk activity. Older hard drives are particularly sensitive to this type of activity.In the background, Windows downloads compressed files, decompresses them, validates their integrity, backs up the current files, and replaces the old ones. Each step requires processor power. Feature updates can be several gigabytes and therefore require significant amounts of bandwidth. Following installation, Windows rebuilds the search indexes and performs optimization tasks that generate additional slowdowns.

Why Windows Update is causing slowdowns

Background downloads. While Windows is downloading updates, it is competing with whatever you are doing at the same time. If you are playing games, your game needs processor power for rendering and physics. Windows Update is utilizing 10-30% of that, and you can sense it as stuttering, lag, or slow response times. Worst of all, you may not even realize that it is occurring. Windows downloads updates silently. The first indication of this is typically a rapid decline in your FPS or significantly longer load times for your web browser.Slowdown after installation. Following a Windows Update, Windows rebuilds the search indexes, reconfigures system components, and runs optimization tasks. As a result of this, your PC will normally appear sluggish for 10-30 minutes following a reboot after a Windows Update. On a solid state drive, this will generally take 10-15 minutes. On an older hard drive, it could take 30 minutes or more. Do not panic. This is temporary and normal. Your PC is performing maintenance. If your PC appears sluggish for more than an hour following a Windows Update, there is likely something else causing the issue.Unplanned reboots. This is the reason many users consider disabling Windows Update altogether. You leave your PC unattended for a while, and upon returning, your PC has rebooted. Any unsaved work has disappeared. Your game session has concluded. Windows attempts to perform the reboot during an inactive period, but it does not always succeed. Fortunately, this is easily corrected by setting active hours.

When updates actually break things

Beyond the temporary slowdown during installation, sometimes the update itself introduces a permanent performance regression. This is not hypothetical. In November 2025, Digital Foundry's Sam Machkovech confirmed that the Windows 11 October patch (KB5066835) sliced frame-rates in Assassin's Creed Shadows by 33 to 50 percent. The testing was done on a high-end system — a Ryzen 7 9800X3D with an RTX 5090 — and the drops were dramatic enough that Digital Foundry started considering Linux alternatives. Counter-Strike 2 was also affected, with increased stuttering and frame-rate dips reported by players.Nvidia had to step in with an emergency fix. The GPU maker released hotfix driver 581.94 specifically to address the damage caused by this single Windows update. As Tom's Hardware reported, gamers celebrated up to 50% performance gains after applying the hotfix — meaning they had been losing up to half their frames since the October patch without necessarily knowing why. This wasn't a niche issue. It affected both Windows 11 24H2 and 25H2 users across multiple game titles.This is why managing update timing matters so much. Even when updates are well-intentioned, they can break things. The safest approach is to let others go first: pause updates for a week after each monthly patch cycle, check gaming forums and tech news for reported issues, and only install once you're confident the update is clean. You still get every security patch — just a few days later, after the community has verified there are no showstoppers.

Should you turn off Windows Update?

The risk/benefit tradeoff. We understand why users desire to turn off Windows Update. The timing of the updates is inconvenient. Unplanned reboots. 30 minutes of slowness following a reboot. It is very frustrating. However, disabling Windows Update exposes your PC to a greater number of risks. Every month, Microsoft addresses the vulnerabilities that hackers are currently exploiting. If you do not apply these patches, your PC is an easier target.What will occur if you disable it. There are three outcomes over time. No security patches — the 2017 WannaCry ransomware attacked 200,000 computers in 150 countries. They missed a patch that had been available for two months. No driver updates — your Video Card, network adapter, etc., need driver updates to maintain stable operation. No bug fixes — Windows contains bugs, and Windows updates repair them.A better option: configure, don't disable. Instead of disabling Windows Update, obtain control over when it is executed. Windows offers numerous methods to manage the timing of when updates occur. None of these methods jeopardize your security. All of them offer you the ability to regain control over your PC.

Security vs convenience

The true question is not whether to update — it is when. Security and convenience are not mutually exclusive. You can achieve both if you are willing to invest 60 seconds configuring a few settings.Security patches protect you from actual threats. In 2024, Microsoft addressed over 900 vulnerabilities. Several of these vulnerabilities were being actively exploited by hackers before Microsoft released the patches. Therefore, skipping these updates is not worth the risk, regardless of how inconveniently timed the updates are.Therefore, the easiest method to resolve the issue is to continue to enable updates, but control when they are executed. Then, you receive each and every security patch without the surprise reboots or mid-game slowdowns. Below, we'll detail precisely how to accomplish this.

How to configure Windows Update timing

Define active hours

Active hours inform Windows about when you are using your PC. Windows will not restart your PC for updates during these hours.1. Open Settings.2. Select Windows Update.3. Click “Advanced options.”4. Click “Active hours.”5. Establish the hours that reflect when you are using your PC (e.g. 8 AM - 11 PM).This is the most effective method to avoid unplanned reboots.

Pause updates when you need to

Prior to a LAN event, important presentation, or any time you need the highest level of performance:1. Open Settings.2. Select Windows Update.3. Click “Pause for 1 week” (you can extend this to up to 5 weeks).This pauses all download and installation activity. Once you are ready, resume updates and permit updates to catch up.

Use a metered connection (to limit bandwidth)

If you have limited bandwidth or wish to restrict Windows from consuming a large amount of bandwidth:1. Open Settings.2. Select Network & Internet.3. Click your WiFi or Ethernet connection.4. Toggle “Metered connection” to On.Windows will not download large updates on a metered connection. The tradeoff: you will need to manually verify for updates periodically.

Schedule the restart

If an update has been downloaded and requires a restart:1. Open Settings.2. Select Windows Update.3. Click “Schedule the restart.”4. Determine the date and time that suits you best.Establish it for 3 AM or at any time when you are not operating your PC.

Maintenance tasks after a major update

Following a major update, your PC requires a short interval to stabilize. Here is what you can anticipate, and how you can expedite the recovery.Wait 10-15 minutes. Following a restart, permit your PC to remain idle for a while. Windows is reconstructing the search indexes, optimizing the newly installed components, and executing the background operations. On a solid state drive, this requires approximately 10-15 minutes. On an older hard drive, allow 30 minutes.Verify disk space. Large updates can create temporary files. Open Settings, navigate to System, then Storage, and execute “Temporary files” cleanup. You can normally recover 500MB-2GB of disk space.Validate your drivers. At times, a Windows update may reset your Video Card configuration or install a default video driver. This is not theoretical — in late 2025, a routine Windows update broke Nvidia GPU performance so badly that Nvidia had to release an emergency hotfix driver. After every major update, open Device Manager and confirm that your Video Card, audio, and network drivers are still the proper versions. If your games suddenly feel slower after an update, check your GPU driver first.

Why we develop guides such as these

IQON began as a PC optimization application. However, we recognized that the individuals that required the greatest assistance were the ones least able to access useful information. Casual gamers, parents, students, etc. They desired their PCs to cease being slow. They sought answers and encountered either technical jargon or perilous recommendations such as “turn off Windows Update.”As a result, we started developing guides that define “why” before “how.” Each piece is written to begin at zero and does not presuppose familiarity with previous material. Whenever something is hazardous — such as disabling security patches — we will advise you truthfully.Knowledge should be free and accessible to everyone — irrespective of whether you utilize our software or not.