Some people complain that Delivery Optimization eats all available bandwidth and wont disable.
This guide fromMiniToolhas some effective methods for helping you.
It retrieves data from both Microsoft servers and web connection peers to improve download efficiency.

PressWin + Eto openFile Explorer.
Step 2. choose your hard drive and then go to theManagetab at the top to chooseDisk Tools.
SelectCleanupto perform an initial scan withDisk Cleanup.

Then startDisk Cleanupagain and clickCleanup System Filesin the resulting dialog.
It will let Disk Cleanup run another scan.
After scanning, choose everything in the list and chooseDelete.

In this case, you should go to Windows Store and check for any current updates.
If there are any pending downloads, complete them as soon as possible.
Option 3: Close Automatic Updates in Store
Step 1.
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TypeStorein the search bar and chooseMicrosoft Store.
Step 2. punch theprofileicon at the top and selectSettingsfrom the drop-down options.
In theSettingssection, toggle off theApp updatesoption.
Option 4: Configure Registry
Step 1.
Press theWin + Rkeys to open theRundialog.
Navigate to the following category:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config
Step 4.
Then specify theDWORD valuetoDODownloadMode=100.
Heres how to do it.
via parameters
Step 1.
PressWin + Itogether to evokeSettings.
Navigate toUpdate & Security>Delivery Optimization.
In theDelivery Optimizationsection, toggle off the button underAllow downloads from other PCs.
via Group Policy
Step 2.
Inputgpedit.mscin the address bar and clickOKto openGroup Policy.
In the right pane ofDelivery Optimization, look for and double-click onDownload Mode.
Check theDisabledoption and clickApply & OK.
When completed, reboot your PC to see if it is turned off.
Here are the methods to fix it.
Have a nice day!