“I have 16GB of RAM, so why is my PC this slow?” If you use Windows 11, opening Task Manager can sometimes be a shock. Even when you’re not doing much, memory usage may be sitting above 70% or 80%, and the whole computer feels sluggish.

The good news is that your PC probably isn’t broken. Windows 11 has several background features that can use a lot of memory, and some of them may be quietly eating up RAM without you noticing.

In this article, based on the latest information as of March 2026, we’ll walk through six common reasons memory usage gets unusually high in Windows 11, plus settings you can try right away to reduce it. Some fixes can free up memory without even restarting your PC.

First, Find the Culprit in Task Manager

Before changing settings, your first priority is to check what’s actually using your memory. Opening Task Manager is easy.

Steps:

  1. Press Ctrl + Shift + Esc at the same time. This is the fastest way.
  2. Open the “Processes” tab.
  3. Click the “Memory” column to sort by highest usage.

The processes at the top are your main suspects. Write down their names so you’ll know which fix below is worth trying. You can also switch to the “Details” tab to see more specific process names.

Cause 1: “Delivery Optimization” Is Eating Up RAM

From late 2025 into 2026, this has been one of the most widely reported issues among Windows 11 users. Delivery Optimization, a Windows Update service designed to make downloads more efficient, has been causing memory leaks, meaning it uses memory but doesn’t properly release it afterward.

According to a December 2025 report from Mynavi News, there have been cases where this service consumed several gigabytes of memory, and in some cases as much as 20GB. In Task Manager, it usually appears under “Service Host: Network Service.”

Fix:

  1. Go to “Settings” → “Windows Update” → “Advanced options.”
  2. Click “Delivery Optimization.”
  3. Turn off “Allow downloads from other PCs.”

Turning this off won’t stop Windows Update security updates from arriving. The only real downside is that update downloads may be a bit slower, so if your memory is under pressure, it’s fine to disable it.

Cause 2: Too Many Background Apps Are Running

In Windows 11, apps installed from the Microsoft Store, also called UWP apps, can sometimes keep running in the background even when you’re not using them. Apps like Weather, News, and Xbox may fetch data on their own and use memory in the process.

Fix:

  1. Open “Settings” → “Apps” → “Installed apps.”
  2. Click “…” next to an app you don’t use, then choose “Advanced options.”
  3. Change “Background app permissions” to “Never.”

Apps you can usually turn off safely include:

  • News (MSN News) — it only needs to run when you open it
  • Weather — unnecessary if you don’t use widgets
  • Movies & TV — fine to disable if you don’t use it
  • Cortana — most people probably don’t need it anymore

Be careful with work apps like Microsoft Teams or OneDrive. If you disable background access for those, you may stop getting notifications or syncing files.

Cause 3: You Have Too Many Browser Tabs Open

Browsers are easy to overlook. Google Chrome and Microsoft Edge can use 100MB to 500MB of memory per tab. Ever start researching something and suddenly realize you have 30 tabs open?

30 tabs × 300MB = about 9GB. That’s more than half of a 16GB system going to your browser alone.

Fix:

  • For Edge: Go to “Settings” → “System and performance” → turn on “Put inactive tabs to sleep.” Edge will automatically free memory from tabs you aren’t using.
  • For Chrome: Go to “Settings” → “Performance” → turn on “Memory Saver.” It works similarly by reducing memory use from inactive tabs.
  • The real habit fix: Close tabs when you’re done with them. If you’ll need a page later, bookmark it instead.

Cause 4: Too Many Startup Apps Are Loading

If lots of apps launch automatically when your PC starts, your memory is already under pressure before you do anything. This is especially common on manufacturer-built PCs that come with a pile of preinstalled software.

Fix:

  1. Open Task Manager with Ctrl + Shift + Esc.
  2. Select the “Startup apps” tab.
  3. Check which apps are marked “Enabled.”
  4. Right-click apps you don’t need and choose “Disable.”

Apps that are usually safe to disable include:

  • Spotify / iTunes — open music apps manually when you need them
  • Adobe Creative Cloud — unnecessary if you don’t use Adobe apps every day
  • Manufacturer update checkers — checking manually once a week is usually enough

On the other hand, don’t disable security software, including Windows Defender, or cloud sync tools like OneDrive. That can weaken security or stop your files from syncing.

Cause 5: Windows Update Bugs in 24H2 / 25H2

Many users have also reported sudden increases in memory usage after major Windows 11 updates. In particular, version 24H2 and later have had known issues such as these:

  • Memory leak when printing: When printing with v3 printer drivers, the spooler service, spoolsv.exe, may fail to release memory. This issue has been officially acknowledged in Microsoft’s Japan WDK Support Blog.
  • File Explorer memory leak: Repeatedly opening and closing files can cause File Explorer to hold on to memory instead of releasing it.

Fix:

  • Go to “Settings” → “Windows Update” and install the latest updates. A fix may already be available.
  • If memory keeps increasing after printing, restart “Print Spooler” from the Services app.
  • If the problem is severe, the most reliable temporary fix is to restart your PC. A restart resets memory leaks.

Cause 6: SysMain, Formerly SuperFetch, Is Reserving Memory

Windows 11 includes a feature called “SysMain,” which used to be called “SuperFetch.” It preloads apps you use often into memory so they can open faster.

In other words, Windows is thinking, “If there’s unused memory, I might as well get apps ready in advance.” In normal use, this isn’t a problem because Windows can automatically free that memory when it’s needed.

That said, on PCs with SSDs, the benefit is limited because SSDs are already fast. SysMain can also make your memory usage number look high, so if it bothers you, you can disable it with these steps.

Fix:

  1. Press Win + R, type “services.msc,” and press Enter.
  2. Find “SysMain” in the list and double-click it.
  3. Change “Startup type” to “Disabled.”
  4. Click “Stop,” then “OK.”

One caution: if your PC uses an HDD, disabling SysMain may make apps open more slowly. On an SSD-based PC, you probably won’t notice much difference, so it’s worth trying if the memory usage number is bothering you.

FAQ

What memory usage percentage should I aim for?

In general, 40% to 60% while idle, meaning when you’re not actively working, is a normal range. Once usage goes above 70%, the system is more likely to feel slow. If it stays above 90%, freezes become more likely. However, memory reserved by SysMain isn’t always truly “in use,” so for a more accurate view, check the “In use” and “Standby” breakdown on the Performance tab in Task Manager.

Will adding more RAM fix the problem?

If you’re genuinely running out of memory, adding RAM can help. But if the cause is a memory leak, meaning software is failing to release memory properly, the same symptoms can come back over time no matter how much RAM you install. Try the settings in this article first, then consider upgrading if the problem continues.

Does Microsoft PC Manager help?

Microsoft PC Manager is a free optimization tool from Microsoft that can stop unnecessary processes and free memory with one click. As of March 2026, it’s available for free from the Microsoft Store and is safer than third-party “memory cleaner” apps. It’s useful when you want to quickly free up RAM, but it won’t fix the root cause, so it’s best used alongside the settings changes above.

What’s the difference between “Committed” and “In use”?

On the Performance tab in Task Manager, “Committed” means the amount of memory apps have reserved because they might need it. “In use” is the amount they’re actually using right now. Even if committed memory is higher than your physical RAM, it’s not necessarily a problem as long as actual in-use memory is under control.

Can I free memory without restarting?

Yes. In Task Manager, select a process that’s using a lot of memory and click “End task.” That will release the memory used by that process. However, ending system processes can make Windows unstable, so only do this for apps you installed yourself. The most reliable method is still a restart.

References