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I upgraded to W10 as soon as it was made available to me, and was delighted to find that i experienced none of the problems that many users were talking about. It was literally perfect for several months.
Three weeks ago, I started to hear my fan running more frequently, and now all the time. Everything is slower, particularly Firefox. Shut down takes several minutes.
I wish I could identify some change in software or computer setup that coincides, but the only possibility is the addition of Adobe Premiere Elements 13 and Adobe Photoshop Elements 13 at around the time the slowdown started. However, these programs are not in the startup menu and are used less than once a week.

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Computer & system:
Lenovo laptop 64-bit x 64-based processor
i7-4700HQ CPU @ 2.4GHz
installed RAM: 8.0 Gb
Windows Edition: Windows 10 Home

Thanks
Patrick

bbearren mentioned Fan Speed and CPU heat as an area to check. You thanked him but didn’t mention if you actually checked that the vent intakes and exhaust are clear of lint/hair/dust and if not, cleaned them. You can also open the laptop back and check the CPU fan and heat-sink for dust buildup.
My wife’s laptop displayed exactly the same problems as yours – (operating slowly, very hot exhaust plus sometimes it would suddenly shut off) – a physical dusting & cleaning of the air vents solved the problem.

OldChinaHand last posted 4 days and 8 replies ago.
We may never know if the mystery was ever solved. :confused:

Try this…
Right click on empty part of the desktop,
Left click on Personalize,
Left click on Screen Saver,
Make sure that Screen Saver is set to “(None)” and not “Blank”
If Screen Saver is set to “Blank”, the monitor will change to a black screen at time set but the monitor will remain powered on.

You can download past iterations of PSI here:
http://secunia.com/products/consumer/PSI/sys_req/
I switched back to version 2.0.0.4003 shortly after updating to version 3 which I disliked.
It still works perfectly on my Win 7 64-bit but have not tried in Win 8.1.