OneDrive affects Internet connection speed - everything is synced

The issue you're experiencing, where OneDrive significantly slows down your internet connection even when it's not actively syncing, is unusual but not unheard of. This behavior can be caused by several factors, including background processes, network configuration issues, or conflicts with other software.

Check for Background Activity

Limit OneDrive's Bandwidth Usage

Disable Files On-Demand

Reset OneDrive Cache

Check for Conflicting Software

Update Network Drivers

Disable Peer-to-Peer Updates

Check for Windows Updates

Reinstall OneDrive…etc.

Temporary Workaround

If you need a quick fix while troubleshooting, you can pause OneDrive sync when you need full internet speed:

Right-click the OneDrive icon in the system tray and select Pause syncing > 2 hours, 8 hours, or 24 hours.

If the problem persists, we would need more detailed information, such as which OneDrive it is (version) or more detailed information about the digital environment.

Does this issue happen only on this PC or with other devices in your home?

If you connect the PC to a different Wi-Fi network, does the problem persist?

Have you tried disabling any third-party antivirus or firewall temporarily to rule out interference?

My answers are voluntary and without guarantee!

Hope this will help you.