Anyone know what CompatTelRunner.exe is/does?

Glad to hear about the improvement with SSD.  I've been thinking about upgrading to SSD for a while too.  Technically what you achieved was to reduce the impact, not eliminate it.  The task is still checking your system on every boot, it's just running so much quicker for you now, that it is now unnoticeable.  The issue is stemmed from scheduled tasks MS added back in Window 7 days, but left them after the upgrade to Windows 10.  I posted a while ago about how to disable them on this thread.  Check it out.

The Solid State Disk SSD route helped in my case. I routinely check activity and spotted dozens of running instances of CompatTelRunner.exe and arrived here for education/information purposes.

The 20 minutes quoted by TH was 15 minutes here on a desktop tower with workstation class performance. Numerous strategies failed to solve. I had wanted for a while to move to Solid State Disk SSD and finally as prices became more reasonable I took the plunge. The installation process was surprisingly straightforward to do with some initial advice from the shop.

The upshot of all this was immediate responsiveness. from the first moment of start up, as now the disk is no longer maxing out at 100%. There is enough bandwidth free for programs (especially Task Manager and Resource Manager) to run without  the former 15 minutes latency and the initial surge of disk activity soon clears.

Originally Business edition of Vista was suspected as a cause for double writing files to disk (or so I believed) but having successively upgraded to Windows 7 Pro then Windows 10 that seems remote and in the past.

I realise you shouldn't have to upgrade to get around the problem (especially with changeover cost and some downtime). Generally improved responsiveness was sought but getting "zero" startup latency was a big benefit. The machine can now be more regularly shutdown and restarted without onerous time penalty and benefit gained from shutdown/startup cycle clearing out memory and paging files.

Actually, here’s one excerpt from Microsoft’s privacy statement that everyone can understand:

Finally, we will access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders), when we have a good faith belief that doing so is necessary to: 1.comply with applicable law or respond to valid legal process, including from law enforcement or other government agencies; 2.protect our customers, for example to prevent spam or attempts to defraud users of the services, or to help prevent the loss of life or serious injury of anyone; 3.operate and maintain the security of our services, including to prevent or stop an attack on our computer systems or networks; or 4.protect the rights or property of Microsoft, including enforcing the terms governing the use of the services – however, if we receive information indicating that someone is using our services to traffic in stolen intellectual or physical property of Microsoft, we will not inspect a customer’s private content ourselves, but we may refer the matter to law enforcement.

Read it for yourself here. HTTP://bgr.com/2015/07/31/windows-10-upgrade-spying-how-to-opt-out/

 

Giving themselves the 'right' to give out information they should never have had in the 1st place.

The internet thanks to Google and Microsoft and the likes have turned the internet into a anti-privacy tool for information that once was private and required a court order to obtain.

Amazing what can be done when you have Government backing and nobody stopping the invasion into people lives.