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Why my MacBook is slow

Hello.

My MacBook Pro is having issues, there is no Apple official shop in my country.

The computer became very slow and even the mouse is slow. The computer is not overheating.

Can somebody help me?

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As you didn't tell us your exact model we had to answer very generically. If you want more you'll need to tell us your exact system. Paste your systems serial number into this web site: EveryMac - Lookup it will tell you your systems details. Paste the system URL here so we can see it too.

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I changed my hdd in january and upgraded to yosemite it was working good i don t use the macbook too much. One week ago the mac started to become slow. The hdd is mostly empty. But the cpu usage is at a very high level. Ram is normal. How can I do bootable usb?

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Here is the link of the macbook model. My new hdd is a 1tb toshiba sata drive. I was using it nearly one year. http://www.everymac.com/systems/apple/ma...

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Sounds like your drive is having problems. I would start off making a bootable USB thumb drive while you can. Also make sure you've made a good backup!

Once you have your external bootable drive setup copy to it the OS installer as you may need to redo your OS install. Now booting up under it (hold the Option key to get to the Boot manager) run Disk Utility from the external drive to check the drive if it comes back with errors you may need to reformat the drive.

The other possibility here is the drive is too full! This is were you need to do some TLC on your system. delete as much old junk as you can as well as clear your cache and log files. I find this tool makes quick work of clearing the cache & log files: Disk Doctor. The last thing here is to defragment your HD, this is the tool I use: Drive Genius. There are other apps out their that will work as well I just find this are the best I've found.

If your drive is not able to be saved as it has too many errors. Its time to think about getting a new drive. I would recommend getting a hybrid drive (SSHD) like this one: Seagate laptop SSHD or look at getting a SSD which is more expensive so you'll need to think if its justified.

Don't forget you want to leave at least 1/4 of the drive free and SSD's tend to need more free space 1/3 on the smaller drives.

Update (12/01/2016)

Since you have a new drive here I'm suspecting your SATA cable needs replacing.

If you look at your original Apple drive you'll note the drive was SATA II (3.0 Gb/s). I'm suspecting you put in a newer drive which is likely SATA III (6.0 Gb/s). While your system can support it, Apple didn't give you a cable that was spec'ed for SATA III so you are hitting a known issue here.

What is happening is your system and drive are having a fight as the CRC check sum of the data block being moved is coming back as bad so the drive either needs to send it again or the system needs to send it to the HD again. That explains why your CPU usage is running high. If you open Activity Monitor you'll likely note the indexer is the one running heavy here.

The indexer runs to build a search list based on what your files you have on your system. If you do a restore or copy files back onto your new drive this is what sets it off. Overtime the process will finish the indexing until the next time you more, create or delete a file. But in this mode only the small group of files will be involved Vs an entire backup or mass move.

OK, here's the IFIXIT guide you'll need to follow: MacBook Pro 13" Unibody Late 2011 Hard Drive Cable Replacement and here is the better cable to use: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable.

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable 이미지

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MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

$44.99

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I changed my hdd in january and upgraded to yosemite it was working good i don t use the macbook too much. One week ago the mac started to become slow. The hdd is mostly empty. But the cpu usage is at a very high level. Ram is normal. How can I do bootable usb?

http://www.everymac.com/systems/apple/ma...

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OK, well you can forget the maintenance aspect of my answer then. Review the update.

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Ok I'll order this cable and let you know. Thank you.

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Any news on replacing the SATA cable? Thats the ticket here!

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I am waiting for the delivery

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Hi, the issue could also be a faulty sensor (like a thermal, voltage or current sensor on the logic board) - a computer running very slowly but staying cool doesn't seem like a software issue. I would strongly recommend running a diagnostic test to confirm whether this is the issue or not before ordering parts. You can use a program such a TG Pro, but Apples's built in Apple Hardware test should suffice as well. You can access apple hardware test by holding down the "d" key as your mac starts up.

If you mac does have a faulty sensor, a process called Intel SpeedStep executes useless processes that consume the processor's power, preventing the processor from overheating as a safety mechanism (since the computer can't read a faulty sensor, it doesn't know if the processor is actually overheating so it just makes it as cool as possible by preventing the processor from heating up). This however, makes the computer run very slowly. If you look at Activity monitor, does a process called "kernel_task" take up a big percentage of the CPU?

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Kernel_task is the biggest application. 351 mo. What can I do to fix it?

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I changed the ram memory to 8gb and It seems to be working. But the computer is becoming hot sometimes and the fan is runing at max speed

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Hm, that's strange. If you open activity monitor with no other applications open, what is the CPU usage in %?

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i've been looking into this for months - it started after I updated the ios....

Programmes took ages to load. Activity monitor showed CPU idle 90% + and memory 4GB available...

This just worked for me...

I think the updgrade started icloud syncing desktop / document folders. Now I've stopped it things are much better.

Also I removed clean my mac and hp utilities as other posts have said this can cause memory leaks.

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