Checking for Throttling To determine if your ISP is the bottleneck, you can run a speed test while a download is actively happening and compare it to a test performed on an idle connection. Bandwidth limits, whether set intentionally by the user or accidentally during a previous configuration, are a common culprit for slower than expected updates.
Troubleshooting Steam Download Lag and Improving Speed
Local Network and Connection Type Your home network environment is often the biggest variable in download performance. Choosing a geographically closer region can reduce the number of hops your data must make, effectively increasing your download speed and stability.
A significant drop in speed during the download indicates that your ISP is managing or capping the traffic. Some ISPs also throttle specific types of traffic known to consume large amounts of bandwidth, which can directly target P2P protocols used by Steam.
Troubleshooting Steam Download Lag and Slow Speeds
Steam automatically selects a server based on your IP address, but this automated system is not always perfect. Client-Side Settings and Cache Health Steam includes several settings that allow users to optimize their download behavior.
More About Why is steam downloading so slow
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