2012 MacBook Pro now has slow WiFi Speeds at 25Mbps - used to be +300Mbps

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2012 MacBook Pro now has slow WiFi Speeds at 25Mbps - used to be +300Mbps

My 15" 2012 MacBook Pro with OS 10.15.7 Catalina, 2.6 GHz Quad-Core i7, 16GB RAM, and 500GB internal SSD suddenly has slow, underperforming WiFi speed.

This started last weekend on my home network. I used to get well over 300Mbps WiFi download speeds, and now it's 25~30Mbps. My Xfinity cable modem is new, and I have 2Gbps speeds when connected by CAT 6A ethernet cable. The WiFi speed is now slow when using Chrome, Firefox or other browsers. I've cleaned the browser cache, cleaned the Mac's cache, reset NVRAM, PRAM and SMC. I've deleted the WiFi network in network settings and then found it again. I've reset the network location. Nothing has helped.

This is the only device I own suffering this issue. My iPhone gets better wifi speed on the same wifi network. My other MBP has the faster WiFi speeds.

This MBP has the latest OS it can run, and I'm running the latest available version of Chrome for the MacOS, but all browsers are getting the same slower speeds. Does anyone have suggestions on what is happening and how I can fix it?

Earlier Mac models

Posted on Nov 8, 2024 9:43 AM

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Answer 1

Nov 8, 2024 11:26 AM in response to Calkins Guy

By far the easiest way to cause poor performance, instability, overheating and crashing is to install ANY third-party speeder-uppers, Cleaners, Optimizers, or Virus scanners, Bit Torrent, or a VPN that you installed yourself.

are you running any of those?

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Wireless diagnostics

Hold down the Option key while you click on the Wi-Fi icon on the menubar to open up the tools for investigating and fixing Wi-Fi issues

First is "Open Wireless diagnostics", which opens the wireless diagnostics Assistant, but does not proceed.

There are about eight different things you can do from here, but the top-level is to choose Diagnostics off the Window menu, or simply click continue, to do a quick check for Gross misconfiguration or operating problems. Your Admin password will be required. If any recommendations are shown, you should consider then seriously.

Next is to hold down the Option key and click the Wi-Fi icon as before. The screen that opens shows operating parameters of your network. Screenshot, transcribe, or photograph the results and post back in a reply on the forums. Looks like this older one.

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2012 MacBook Pro now has slow WiFi Speeds at 25Mbps - used to be +300Mbps

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