Slow Download Speed But Fast Upload Windows 11 Fix [2026]

Quick Answer: Slow downloads with fast uploads indicate ISP throttling, router QoS issues, or Windows QoS reserving bandwidth. Disable QoS Packet Scheduler in network adapter properties.

Symptoms

Upload 50 Mbps, download only 5 Mbps
Speed test shows asymmetric speeds
Browsing slow but video calls fine
Issue on multiple devices

Root Cause

QoS settings reserving bandwidth, ISP traffic shaping, or cable/DSL line issues.

Fix

Method 1: Disable QoS Packet Scheduler

Network Connections → Adapter properties
Uncheck "QoS Packet Scheduler"
Click OK

Method 2: Disable Large Send Offload

Device Manager → Network adapter → Advanced
Disable "Large Send Offload v2 (IPv4)"

Method 3: Reset Network

netsh winsock reset
netsh int ip reset
Restart-Computer

Method 4: Check Router QoS

Log into router, disable any bandwidth limiting or QoS rules.

How Againly Helps

Againly runs check_wifi_performance to detect QoS conflicts and speed asymmetry.

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Related: Wi-Fi Keeps Dropping

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