Wifi is terribly slow (between 1Mbps and 15Mbps) on my 2011 Macbook Pro running High Sierra. On all other devices, iPad, iPhone, iMac, PC it is above 80Mbps. Ethernet is slow as well. Sometimes I hit spikes of around 50Mbps for a couple of minutes, but I don't know what triggers it.
It doesn't seem to happen if I connect to my phone's personal hotspot. Both phone and Macbook come in around 30-35Mbps, although I didn't test it for long enough to see if it's just a spike as well.
I tried everything in the last couple of days:
- removing wifi network from preferred networks
- renewed DHCP lease
- fiddling with router settings and channels
- connecting to 5Ghz and 2Ghz networks
- resetting network settings by deleting network files from Library/Preferences/SystemConfiguration
- SMC reset
- NVRAM reset
- scanning for malware
- reinstalling OSX
- installing El Capitan from the Time Machine backup of my iMac
- turning off Bluetooth
Any other ideas that might help? Or is it faulty hardware?
Best Answer
Seems the problem was hardware related. Something got stuck in my ventillator which made it stop.
When the laptop overheated after 10-15 minutes it underclocked all hardware, making the internet run slow.