Channel interference can slow down your internet from neighboring peoples wifi. if you have an android phone download the app "wifi Analyzer" when you open the app make sure your phone is on your wifi. It will show all the ssids (wifi names) and the wifi channels that are leaking into your house. Look at the graph and pick the channel that is leased used. You only want to pick channels 1 6 or 11. Having another wifi sharing a channel with you is better then having channel overlapping. Each channel is 5mhz wide but your wifi signal is 20mhz wide. So if two people are on channel 1 and 6 and no one is on 11, but there was a person on channel 9. Channel 1 would be the best option because channel 9 would overlap channel 11 and 6. You can change your wifi channel in your router or access point gui.
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