I upgraded my PC for two reasons. First, the old one was having very bad network issues and was relatively old. Second, to not lose a frame in Blender under any circumstance. So three reasons.
Despite the significant upgrade Blender performance is exactly the same.
The network issues have come back, and I can't sneed.
I woke up today and my computer has identical issues to the one it replaced. No other computer in my house has network issues. My shitty 10+ year old laptop does not have network issues. That laptop's wifi card does not work, so it has a USB adapter for that. If I plug that adapter into my PC, it has connectivity issues. Neither of my LAN ports work. This is a 100% brand new PC.
I have updated every driver. I have updated the BIOS. I have set to metered connection. I have disabled searching for other networks once I am connected. I have run antivirus scans. I have run one program at a time to see if one was causing issues.
I cannot figure out what is wrong. When I get back to the house tonight I'm reinstalling windows.
Total software developer death.
If I had unlimited resources I would have the microsoft HQ's parkinglot firebombed until connection issues improved. I don't even need the internet to get my work done this weekend, I just wanted to play Hunt: Showdown and get the cool 
skin.
The entirety of my day has been spent trying to figure out why my ping spikes to 2000 every minute or so. The only breaks were eating or when I went on a four hour hike to scream at god.
If you have any guesses as to why this is happening, let me know.
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Bad Qi. Solution - move your entire setup to a place with auspicious Qi, as outlined here https://www.wikihow.life/Feng-Shui-a-Workstation
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Sounds like your only choice left is to rope
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Did you try turning it off and back on again?
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Bufferbloat, bad Ethernet cable, bad mobo, bad OS install, bad drive, bad router, bad modem, bad Internet, could be a bunch of possible things. Using a Live USB Linux distro, does the problem persist?
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Every PC in the house gets an F when we test bufferbloat but no one else reports problems.
I took the PC to a different house to try it on another network and I have no issues whatsoever. Based on everything I've tried over the weekend it seems like my network has some kind of issue with my PC.
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What's you isp? See if you can cap your router's internet to about 90% of what it reaches now with a speed test. Putting a cap in place can greatly reduce the latency. Did you use the same ethernet cable in both places?
Also might want to enable FQ-Codel on your router, that also solves these issues.
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Thanks I'll do all of that once I get back to my house. Same cables. WiFi is better here too. Spectrum at both houses. If the plans are different the one at my house would be better.
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Spectrum is notorious for fricking up the wiring in some neighborhoods, there is nothing you can do about it besides implementing something like FQ-Codel. When I had Spectrum, enabling that on my Ubiquity router was the only thing that worked. If the router you are using doesn't support the feature, you'll have to buy one that does (or something similar). Remember to cap upload and download, the latency goes both ways.
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Stop microwaving tendies every minute.
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the only thing that fixed random
spikes 
for me was running 
an ethernet cable 
downstairs to the router
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If he's doing all this troubleshooting for a wifi connection he should honestly rope and take his family with him
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Get a wireless card
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Seems like you've been hacked. I recommend unplugging your computer, taking out to the backyard and burning it in a barrel just to be safe
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Ethernet cable all the way to the router
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