Choppy mouse while loading web pages. Slow loading web pages, ALL browsers, Chrome, Edge, Firefox, IE.

I have turned off all unnecessary start up software.  I keep both the task manager and System configuration utility on my desktop since windows 2000.  I used to do network administration in win 2000.  I have kept up fairly well with the administrative system settings.  I keep my system pretty clean.

I built this system recently, and my first windows 10 installation was actually in December.  So it has not even been as long as what I said before.

I have not experienced this much trouble in a very long time!  I guess windows 8 was bad.  I boxed it back up and never used it.  But, then I was able to install win 7 again.  This time I can not!  I am forced to use a bad operating system!  We must live in the USSR now days!

(1) What do mean by "reinstalled every 4 months"? Are you doing clean installs, or are you returning to factory install state?

(2) What about what I posted earlier...?...

https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows

How to perform a clean boot in Windows

That approximates a clean install by turning off 3rd-party services & startups. Here are the ones I've got...

(3) Post a site or two that loads slowly & causes the problems. I'll go see what happens to this Dell Inspiron 3542.

My PC is 6 months old!  These problems started months ago!  Windows 10 is so unstable that it needs to be reinstalled every 4 months!  That is worse than windows XP.  That is so bad you have to go all the way back to windows Vista for inability equivalence, or maybe windows 8.  If Microsoft makes it any more unstable, you might as well put your next release out on 3.5 floppy disk!  Microsoft should have stopped at windows 7 and continued updating and selling it.  Windows seven was the only truly stable system Microsoft ever made.  Probably will be the only stable system they will ever make! 

Microsoft is making a HUGE mistake by trying to have one operating system for tablets and PCs!  You can not have a system that will flawlessly play high end video games that will operate on a tablet.  Microsoft must make a separate tablet operating system from PCs or Microsoft will fail at both!  A tablet operating system on a PC is STUPID!!!  I don't have a touch screen on my desk top PC, and I NEVER want one!  I want to play games and surf the net, email, and occasionally write something to print.

If Microsoft had any intelligence at all they would look at the shear number of PC video games being sold and start prioritizing them!  It drives the whole industry!  Sadly you could fit the wisdom of the entire board of directors into a thimble!

(1) A clean install might be a good idea to be rid of accumulated junk & ASUS bloatware that may have come with the computer. Especially if it came with McAfee or such that has tentacles all over the place & could be tough to be completely rid of otherwise. Windows Defender is built in & is sufficient, I think. But ASUS may have other big things in there too equally duplicative or otherwise unnecessary . You might check for an ASUS recovery partition that could return the computer to factory state & decide whether you want to keep it. I got rid of mine that would have returned this Dell back to Win 8.1.

Here's a big write-up...

https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/clean-install-windows-10/1c426bdf-79b1-4d42-be93-17378d93e587

Clean Install Windows 10

(2) But maybe start with a repair-install that keeps all files & 3rd-party apps to see whether it is a sufficient cure...

(a) Make a Windows system image, at "START, Settings, Update & Security, Backup, Go to Backup & Restore (Win 7)", in case things get worse. Make the Repair Disc to restore it with, or ask Cortana for "Recovery Drive" to make it on USB. Also, see...

https://www.winhelp.us/restore-a-system-image-in-windows-7.html

Restore a System Image Backup in Windows 7, 8, 8.1 and 10

Note1: That's a 3rd-party site. The literature looks good. I know nothing of the links or downloads there.

Note2: For added assurance, it could be good to use 3rd-party imaging software as well. If you have a Seagate or Maxtor HDD, there is a free version of Acronis at their site. Seagate calls it DiscWizard. These are faster, more flexible, & make more compact images. Macrium Reflect & AOMEI Backupper also have free versions.

(b) Download Win 10 Installation media & do the repair-install...

https://www.microsoft.com/en-us/software-download/windows10

Download Windows 10 -  Currently, this is v.1803

Make a Win 10 Installation USB drive or burn an .iso to DVD. As the article says, match it to the Edition (Home, Pro, etc.), Language, & Architecture (64-bit/x64 or 32-bit/x86) of the computer on which it will be used. Instructions are at the site how to use those to do an upgrade. Since you already are version 1803, this will be a repair-install. Basically, you boot to Windows, plug in the media, open it in File Explorer, & click Setup.exe. It will run a bit over an hour. Here are the screens you might see...

https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/how-to-upgrade-to-windows-10-version-1803-spring/617a37da-8fc0-4f33-a3eb-59fe9082f925?messageId=a241803d-31c3-4720-b0e4-9002a989ea3c

How to Upgrade to Windows 10 Version 1803 Spring Creators Update Using ISO File from Versions 1709, 1703, 1607, 1511 or 1507

Edit: Oops. Here is what I was thinking of for the repair-install...

https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html

How to Do a Repair Install of Windows 10 with an In-place Upgrade

But it says, "The installation media (ex: ISO or USB) must be the same edition and same or newer build as your currently installed Windows 10. If it's not, then the repair install will fail."

So - sounds like it might not work. The download likely is a lesser OS Build than you've got. Sorry.

I was just on tech support with ASUS.  The deemed it was a windows issue, not a mother board issue.  They said to reinstall windows.  I bet it will work for a couple of months before it starts again, unless somebody puts out a fix.....  I just love the idea of reinstalling windows every couple of months to keep it working correctly...