I've had my Macbook for about 8 months and never had any problems with it. Recently it started running very slow - freezing, mouse moving slow, typing response slow. I tried some solutions I found online (installing all updates, resetting NVRAM/PRAM, reindexing Spotlight, verifying disk permissions, entering purge in terminal). None of these worked. I checked Activity Monitor and the problem appears to be with the CPU, since every time the computer is running slow the Idle % is under 10%. Out of an abundance of caution, I uninstalled two Chrome plugins which were the only things I've installed in months (Adblocker and Disconnect.) I don't use any games or any other apps - pretty much all I do on my laptop is browse the internet on Chrome and use MS Word. I also have plenty of disk space, so I know that lack of storage is not causing this problem.
The only thing that has worked, at least temporarily, is shutting down, connecting to power source, and holding ctrl option shift power for 10 seconds, then turning back on (this was suggested in another thread on these forums.) The first time I did this it worked like a charm - my computer worked fine afterward, with the idle% back up to well over 90. However, it started running slow again the next day. I repeated the key process and again it seemed fine. Then again it slowed.
At this point I've tried the same solution several times and it doesn't seem to be helping anymore. Upon startup the idle% use in Activity Monitor is anywhere between 4% and 10%. The kernel_task is showing around 350% in Acitvity Monitor.
I have a very important test coming up at the end of the month and I'm studying 16 hours a day, and can't afford to be away from my computer for long. Is there ANYTHING I can do to fix this from home, or does it need to be taken into Genius under Apple care? If so, will they have to send it out and replace the hard drive, or will it be an easy in-store fix?
Any information would be appreciated! I am about sick to death of Apple products (my old first gen Macbook Air had to have its hard drive replaced twice and its screen replaced once.) If I can't find a solution I may have no choice but to up and buy a PC.