D-Link DIR-825 User Manual page 45

Secton  - Configuraton
Enable QoS Engine: This option is disabled by default. Enable this option for better performance and experience with online games and other
interactive applications, such as VoIP.
Automatic
This option is enabled by default. This will allow your router to automatically determine the network priority of running
Classification:
programs.
Dynamic
This option should be enabled when you have a slow Internet uplink. It helps to reduce the impact that large low priority
Fragmentation:
network packets can have on more urgent ones.
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