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I never had issues with my laptop performance till some windows 8.1 updates earlier this week. At first, I thought it might be some malware, so I run all kind of tools and scans (it took me a really long time), but no issues were found and the laptop was showing an extremely bad performance: folders, programs and websites taking several minutes to load, as if I/O operations had slowed down by 20x, Chrome saying "waiting cache..." Then I went for a system restore, which fixed other kind of issues in the past, but for some reason I had a single restoration point and the rollback didnt solve the issue.
Then I came across this question: windows 7 fast in safe mode but extremely slow in normal mode
Exactly my problem, in safe mode, I'm able to use everything normally (but laptop overheats a lot, so its a temp workaround to be avoided)! Then following the advice there, I tried to restart in debug mode, and progressively turn on different services, but as someone suggested, MS isnt likely to be the one causing the issue, so I selected all the Windows services and I turned all of them on... Guess what, the problem is back again.
So now my question is, how do I find which service is causing the issue so that I can disable it? There are several to go for the trial-error approach, and many of them have dependencies to each other...
Thanks in advance, any help is really appreciated!
When checking the CPU usage (I was exceptic about it since the values often seem to be quite weird, ie. why there's always so much idle CPU?), I realized the guilty of the slow system was Microsoft Windows Defender Antispyware (MSMpEng.exe) with an average usage of 13-20%, which doesn't sound like a lot to me, as allegedly there's almost another 85% left... But since it may monitor resources and files, might become a bottle neck tho. I´ve disabled it and I managed to start the system quite smoothly, not sure if as much as prior to this issue, but we'll see. – Dane411 – 2018-07-21T09:49:20.257