An app using lots of network bandwidth slowing down the PC

Symptoms

• Web pages load slowly while a specific app is running
• Streaming or video calls stutter during use
• Task Manager's Network column shows one app using far more than others
• Slowdown clears up once the app finishes its task or is closed

Likely causes

• CommonA large download or update running in the backgroundGame updates, Windows updates, and app updates can be many gigabytes.
• CommonA cloud backup or sync app uploading a large batch of filesInitial backups especially can saturate upload bandwidth for hours.
• PossibleA streaming or torrenting app running continuouslyThese can use significant sustained bandwidth.
• PossibleAutomatic updates for multiple apps running simultaneouslySeveral apps checking and downloading updates at once compounds the load.
• Less commonMalware using your connection for its own purposesSome infections generate significant unexplained network traffic.

What to do

1. Open Task Manager, go to the Processes tab, and sort by Network to identify the heaviest user.
2. If it's an expected task (a game update, backup), let it finish or pause it for now if you need bandwidth immediately.
3. Check that app's own settings for a bandwidth limit option, common in backup and sync tools.
4. Schedule large downloads or backups for times you're not using the internet heavily, like overnight.
5. Close or pause apps you don't need running right now to free up bandwidth for what matters.
6. Check your router for Quality of Service (QoS) settings if you want to prioritize certain traffic (like video calls) automatically.
7. Run a malware scan if you see unexplained network usage from a process you don't recognize.
8. If it's a recurring issue with a specific app, check whether a setting exists to reduce its background update frequency.

Tools and parts

• None required

When to call a pro

This is a software/settings issue you can typically resolve yourself; professional help isn't necessary.

Safety