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WiFi Issues After macOS Sierra 10.12.6 Update
Ever since I did the latest macOS Sierra Update, I’ve been having horrible wifi connectivity, the speed just keeps dropping sometimes to decimals. I’ve done everything to help including a custom wifi network, and resetting PRAM. Can someone help me solve this problem? Please help!
 
 
This is what I’ve done so far. And reset PRAM, and the obvious like cycling the router.
 
۱: Remove Existing Wi-Fi Preferences in macOS Sierra
This is going to involve removing some system configuration files, therefore you should backup your Mac first, just in case. Do not remove any other system configuration files.
Quit any active applications that are using wi-fi or the internet (Safari, Chrome, etc)
Turn OFF wi-fi by selecting the wi-fi menu bar item and choosing “Turn Wi-Fi Off”
Open Finder in macOS and pull down the “Go” menu and choose “Go To Folder” (or hit Command+Shift+G to get there quickly)
Enter the following path exactly into “Go to folder” window and choose “Go”
/Library/Preferences/SystemConfiguration/
Locate and select the following files in the SystemConfiguration folder
com.apple.airport.preferences.plist
com.apple.network.eapolclient.configuration.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist


Remove those matching files, you can either place them into a folder on the desktop as a rudimentary backup, place them into the Trash without emptying, or actually delete them
After those matching wi-fi configuration files are out of the SystemConfiguration folder, reboot the Mac by going to the  Apple menu and choosing “Restart”
When the Mac has booted back up as usual, go back to the Wi-Fi menu and choose “Turn Wi-Fi On” and join your typical wireless network
When the Mac boots back up and wi-fi is enabled again, for many users their wireless internet connection will immediately work again as expected. If that’s the case, be satisfied with the relatively easy troubleshooting process and you don’t need to proceed any further.It’s often a good idea to reboot the wi-fi router the Mac is connecting to as well, which can resolve some simpler wi-fi router issues that sometimes pop up with certain router brands and Macs. This is easiest in a home environment where you can just unplug the router, let it sit for a minute or so, then plug it back in again. Obviously for a work or school computing environment that may not be possible though.Is your wi-fi working? Great, then you don’t need to do anything else. But what if your wi-fi is still dropping, still slow, still losing a wi-fi connection randomly when waking from sleep or for no apparent reason? Read on for more troubleshooting tips.
2: Set a New Network Location with Custom MTU and DNS
Assuming you’ve already removed the wi-fi preference files in the first major troubleshooting section above and wi-fi is still problematic with mac OS Sierra, you can proceed
Pull down the  Apple menu and choose “System Preferences”, then select “Network”
Choose Wi-Fi from the left list in the Network panel
Pull down the “Location” menu and select “Edit Locations”
 
Click on the [+] plus button to create a new network location with an obvious name like “Custom WiFi Fix”
 
Use the Network Name dropdown menu and select the wi-fi network you want to connect to
Now choose the “Advanced” button in the corner of the Network panel
Go to the “TCP/ IP” tab and choose “Renew DHCP Lease”
 
Now go the “DNS” tab, and under the “DNS Servers” list section click on the [+] plus button, adding each IP onto it’s own entry: 8.8.8.8 and 8.8.4.4 – these are Google Public DNS servers that are free to use by anyone but you can pick different custom DNS if you’d prefer
 
Now select the “Hardware” tab and set the ‘Configure’ option to “Manually”, then adjust the “MTU” option to “Custom” and number to “۱۴۵۳”
Now click on “OK” and then click on “Apply” to set the network changes
Exit out of System Preferences and open an app that uses the internet like Safari, your wi-fi should work great now.

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