Are you using WiFi (either Killer or Intel or Dell or Qualcomm WiFi card) or Realtek Ethernet (hard-wired) connection from this PC to your router/modem? When was last time you scanned this PC thoroughly for malware? Malwarebytes (free) would be a good tool to use. Are all the drivers up-to-date? What version of BIOS is installed? v2.21.0 is the latest version. Have you looked in Device Manager to see if anything "Unknown" is listed and/or something is marked with either a ! or an X ?
Hello, running an Inspiron 3670 for several years without any issues, now the internet is basically unusably slow. Keystrokes take almost 30 seconds to appear. I have a DSL connection in a small business office and the other machines breeze along beautifully as usual. I ran Dell Diagnostics and it wanted to install an updated driver for video, and now I have the MOST ALARMING screen with the image of a rusty pipe with a valve and a scrolling green progress indicator type image, though that has been going along for almost an hour without change. I almost shut the computer down when the screen went black and that image appeared, but I looked it up on my phone and this is apparently legit. Now thinking of shutting it down because it seems stuck in this diagnostic loop. No other programs run slow on the machine except internet, and diagnostic for the network/internet tell me that I am "connected to the internet" and everything is fine. I have rebooted the modem and cleared cookies, cache and I delete temporary files a million times a day, since that sometimes speeds things up.  I updated from Windows 10 to Windows 11, thinking that might help but there is no change. Is there a way to determine if a specific program is corrupted so I can uninstall and reinstall? I hoped Dell Diagnostics would do that but so far it isn't finding anything specific. Appreciate the help!
Impossibly slow internet on one computer only