What Makes My Wifi Slow? How to fix it

Updated: 4 days ago

Hi all,

I just thought we would share some thoughts on what slows down WiFi. No matter what brand of wifi or access point you have, Cambium, Meraki, Cisco, Xirrus, Ruckus, or Unifi this is how to find your reasons for slow WLAN. Here are my thoughts to make your wifi faster!

1. Interference is one of the big reasons that will make your WiFi slow.

Other radios using the same frequency, this is usually the number one cause. If you are using the old 2.4G radio, it may have too many other clients and access points using the same. The best fix is to move to the 5G portion of your access point or router, it actually has more room for more radios, with Xirrus you can move both radios to 5G just click on the controller to change.


2. Channel interference

This is too many radios using the same channel, the easiest fix is to turn on the Auto channel selection on your controller or Cambium cnMaestro Controller. Then the access point will find the clearest channel for your clients, phones, and laptops.


3. Access Points too close together!

You should never, even in test, place your access points within two meters of each other. The access point radios will interfere with each other, slowing or stopping your wifi. Also, placing your access point or router too close, one meter, to TV or lighting systems, both of these will generate interference with your access points.


4. Walls is the biggest enemy of WiFi

WOW, this is a big one. Every wall, you go through, will most likely, reduce your speed of WiFi by 30-50%, depending on thickness and construction. Multiple walls, such as hotel hall installations may mean three walls to the bed, resulting in a decrease of speed by 75-80%. If you are measuring 5G, maybe a 90% drop in speed. Always best to install inside the room if possible, if not possible, then careful location mounting of the access point is critical. Best to measure, move, and measure again to get the best signal to the bed area.


Otherwise, books, such as a library or accountant room, can be really difficult for all wifi. Once again focus on where the people are going to sit.


5. Correct power settings on each Access Point if in a large, congested area.

Turn DOWN the power settings to reduce the interference, do NOT turn the power-up. This is especially important in large meeting rooms with multiple access points.


6. Trees and leaves will slow down your outdoor wifi installations.

Radio waves and trees do NOT go live together well.

7. Too many clients on the same Access Point.

Remember, the access point or routers, need to share time with each client or device. If you are using access points that are over 2 years old, try to limit to 40 clients per access point to speed up your network.


With the new Cambium Wifi 6 access points, these problems will mostly disappear. My suggestion is to place one or two of the new Wifi 6 access points in the busiest parts of your network. You will be happily surprised at the new speeds of your whole network even with buying just 2 or 3 access points.


> Will WiFi 6 kill cables? <


8. Water or rain can really slow down all outdoor wifi.

The wifi will still work but the speed will be impacted if transmission through rain or over water.


9. Network cable infrastructure can really slow down all wifi but will be critical with Wifi 6 access points.

Wifi 6 access points have the capacity to see speeds in excess of 1 G and with full duplexing. This means they will be faster than most of your cable installations with Class 5e or 6 cables. You should carefully consider any edge switch installations to allow at least 2.5G ports with your same 5e or 6 cables, no need to run new cables just upgrade the switch. If you do not your speeds will never approach the Wifi 6 capabilities.


10. Your edge switch uplinks can really slow down your wifi bandwidth.


If you are using older 100Meg or 1Gig switches, they can cause you very slow networks and high packet drops, especially if you are upgrading to wifi 6. Use switches that offer 2.5G ports and 10G uplinks that can automatically configure the ports to your devices, saving you time and money.


11. Cellular tower interference

WOW, this one is hard to fix. With Cambium, we have built-in fixes within the access point due to our focus on Cambium Backhaul but many others do not. If not Cambium or Xirrus, then try relocating the access point to reduce the interference.


12. Placement of the access point is very important for good WiFi.

Even with Omni access points. If roaming is critical, remember to place the access points close enough that they can talk to each other directly, that is how roaming really works. Too close may cause interference but close enough to "talk", usually within line of sight and 40 meters maximum.


So, if you are having any problem can not be fixed. Contact us and we will help you with our best Network Solutions.

Hồ Chí Minh - Việt Nam

Masteri Thảo Điền, Xa lộ Hà Nội

​Phường Thảo Điền, Quận 2

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