If you are unable to achieve full speed on your 802.11n router, e.g. 300mbps always goes down to 144mbps, we are here to help you clarify some of the issues.
Make sure your wireless LAN card on your device supports 802.11n standard. It obviously must be an 802.11n capable device.
802.11n router would not up to full speed with using 802.11a/b/g/n clients simultaneously.
Connect 802.11a/b/g/n clients to the same router, that would slow down the speed to fulfill the the wireless capability.
Open a browser and connect to router setting page.Click on “Wireless” and select “20/40 MHz” or”40 MHz”.
802.11n can combine two 20 MHz channels to form an effective bandwidth of 40 MHz. 40 MHz enables higher data transmission rates to be achieved as compared to 20 MHz. When you select 20/40 MHz mode, the router decide to use 20 or 40 MHz based on the interference/contention the router detected. Care should be taken when using 40MHz mode, the legacy client may not be connected to the router.
However, when using a wider channel bandwidth, there are fewer channels available for other devices, making more interference/contention with neighboring WLANs due to increasing overlap. In order to avoid excessive interference, the Wi-Fi Alliance develops an advice: setting 20 MHz in 2.4GHz as default. 40MHz is still appropriate for some situations, e.g. in a warehouse, but we do not recommend that using 40MHz in the 2.4GHz band for dense residential areas.
Open a browser and connect to router setting page. Click on “Wireless”, and Choose “WPA-Auto-” or “WPA2-” in drop down list of Authentication Method. And then select “AES” in drop down list of WPA Encryption.
WPA (Wi-Fi Protected Access) and WPA2 (Wi-Fi Protected Access II) are standards-based security protocols from the Wi-Fi Alliance that provides enhanced protection from targeted attacks and was developed to provide a migration from WEP. Both WPA and WPA2 offer a high level of assurance and stronger performance than other security protocols, so that both can slow down network slightly. “WPA-Auto-” or “WPA2-” provide AES (Advanced Encryption Standard), which is an encryption mechanism that is stronger than TKIP.
Notice: There are many other different factors that would affect the performance, e.g. wireless radio frequency interference, router brands, congested wireless locations, etc.