How to Fix Delivery Optimization Not Working or Using Too Much Bandwidth on Windows
Windows Delivery Optimization downloading from other PCs slowing your network? DO service using excessive bandwidth? Can't control update download sources? Delivery Optimization consuming all bandwidth? Fix DO configuration issues.
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Main Troubleshooting Guide
How to Fix Windows Update Errors →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Windows updates downloading extremely slowly
- •Network saturated by Delivery Optimization traffic
- •Other PCs on network slowed by DO peer-to-peer traffic
- •DO service using bandwidth even when not updating
- •Settings show DO is disabled but traffic still occurring
- •Monthly DO bandwidth limit being exceeded
Common Causes
- ⚠Delivery Optimization configured for internet-wide P2P sharing
- ⚠No bandwidth limits set for DO downloads/uploads
- ⚠DO cache consuming excessive disk space
- ⚠Background DO traffic competing with user activities
- ⚠Group Policy or MDM conflicting with local DO settings
- ⚠DO not using local network peers when it should be
Solutions
Solution 1: Configure Delivery Optimization Settings
- 1Settings → Windows Update → Advanced options → Delivery Optimization
- 2Set "Allow downloads from other PCs":
- 3OFF: only download from Microsoft servers (most restrictive)
- 4Devices on my local network: P2P only within your LAN (recommended)
- 5Devices on my local network and the internet: broadest sharing
- 6For home users: "Devices on my local network" is ideal
- 7Click "Advanced options" to set bandwidth limits:
- 8Background download limit: try 25-50% of your bandwidth
- 9Foreground download limit: try 50-80% of your bandwidth
- 10Monthly upload limit: set based on your ISP data cap
Solution 2: Fix Excessive Bandwidth Usage
- 1Check what DO is currently doing:
- 2Settings → Windows Update → Delivery Optimization → Activity monitor
- 3Shows download/upload stats for current month
- 4Set hard bandwidth limits via Group Policy:
- 5gpedit.msc → Computer Configuration → Admin Templates
- 6→ Windows Components → Delivery Optimization
- 7Set: "Maximum Download Bandwidth" (in KB/s)
- 8Set: "Maximum Upload Bandwidth" (in KB/s)
- 9Set: "Max Cache Size" (percentage of disk or absolute)
- 10Default cache is 20GB — reduce if disk space is tight
- 11To immediately stop DO traffic:
- 12CMD as Admin: net stop dosvc
Solution 3: Manage DO Cache and Troubleshoot
- 1Clear the Delivery Optimization cache:
- 2Settings → System → Storage → Temporary files
- 3Check "Delivery Optimization Files" → Remove files
- 4Or CMD as Admin:
- 5Delete-DeliveryOptimizationCache (PowerShell)
- 6If DO is not downloading at all:
- 7Ensure the service is running:
- 8services.msc → "Delivery Optimization" → Start type: Automatic (Delayed Start)
- 9Check Windows Update service is also running
- 10If on metered connection:
- 11Settings → Network → Wi-Fi → your network → Metered connection
- 12DO respects metered connection setting and reduces activity
- 13For business: use WSUS or SCCM for controlled update distribution
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