Laptop suddenly very slow

macbbook pro,2.8 intel,4gb memory, suddenly has become very slow

If your Mac runs slowly?
http://support.apple.com/kb/PH13895
Startup in Safe Mode
http://support.apple.com/kb/PH14204
Repair Disk
Steps 1 through 7
http://support.apple.com/kb/PH5836
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Increase disk space.
http://support.apple.com/kb/PH13806
Run Etrecheck and look for and remove third party apps like antivirus software,CleanMyMac2, Rapport,etc
that may slow down the computer.
https://discussions.apple.com/docs/DOC-6173
Best.

Similar Messages

WebDav suddenly very slow

Today, WebDav became suddenly very slow on my iMac running the latest version of Mavericks. Yesterday everything was OK.
When I try WebDav from my iPad things are OK, so I suspect something is wrong on my iMac. I already tried rebooting and resetting PRAM and VRAM.
Does anyone have a good suggestion?

Hello,
Check to see how much free disk space there is. Right or control click the MacintoshHD icon on your Desktop, then click: Get Info. In the Get Info window, click the discovery triangle so it's facing down. You will see; Capacity and Available Make sure you have 10% available disk space, 15% is better. Insufficient available space, can cause performance issues, system corruption, and possible loss of data.
Check the hard disk for errors.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
Read the post by "Klaus1" here. http://discussions.apple.com/thread.jspa?messageID=7668937#7668937
52 Ways to speed up Mac OS X
Carolyn

Recently bought a samsung NX30 camera which came with lightroom 5, after several hours of googling i got it setup properly with the correct camera raw to be able to access my raw images. I found my old laptop was very slow when processing the hundreds of

recently bought a samsung NX30 camera which came with lightroom 5, after several hours of googling i got it setup properly with the correct camera raw to be able to access my raw images. I found my old laptop was very slow when processing the hundreds of images I usually take on a weekly basis. I bought a new faster laptop but when I looked for the cd with the software and serial I could not find it in the Xmas clutter. I downloaded a trial version of lightroom and got it working on my new laptop. Is there a way to access the serial number from my previously installed version and insert it into the trail version to make it work for me?
Myron

Mea culpa
While i registered all my cs2 thru 6 versions and my lightroom 2 thru 4 versions and recorded the serials and saved the adobe registration emails. Since this came as a freebee with the camera i neglected this vital step. I have the instslled version on my old laptop but want to install it on my new one. Thanks to Jim Hess I got the serial so all is well in my world and I will register it with ADOBE
Myron

Mac Book Pro suddenly very slow

MacBook Pro suddenly very slow despite good wifi connection. Should I be scanning for virus? and if so, which product?

Scanning for a virus will be a waste of time. To date there are no know virus' affecting Macs.
More details might be helpful, but in the interim, look at this comprehensive document:
https://discussions.apple.com/docs/DOC-3521
Ciao.

My Mac Book Pro is suddenly very slow. Suggestions?

My Mac Book Pro is suddenly very slow. Suggestions?

Hi p,
Try any of the following which you have not yet done:
Make sure you have at least 15% free space available on your HD.
Check SMART status on HD.
Repair Permissions.
Repair Disk.
SMC Reset.
Safe Boot.
Check Page outs in Activity Monitor.

Help!My MBP is suddenly very slow with frequent loading icon

Was working perfectly Sunday then woke up on Monday and it was suddenly very slow and almost every task prompts the spinning loading icon. Tried a software update, but didn't solve anything. Below is my etrecheck please reply with any suggestions!
Hardware Information:
          MacBook Pro (13-inch, Mid 2012)
          MacBook Pro - model: MacBookPro9,2
          1 2.5 GHz Intel Core i5 CPU: 2 cores
          4 GB RAM
Video Information:
          Intel HD Graphics 4000 - VRAM: 512 MB
System Software:
          OS X 10.8.5 (12F45) - Uptime: 0 days 7:3:51
Disk Information:
          APPLE HDD TOSHIBA MK5065GSXF disk0 : (500.11 GB)
                    disk0s1 (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 499.25 GB (445.33 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-8A8
USB Information:
          Fitbit Inc. Fitbit Base Station
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Computer, Inc. IR Receiver
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Startup Items:
          BIND: Path: /System/Library/StartupItems/BIND
          NortonMissedTasks: Path: /Library/StartupItems/NortonMissedTasks
          NUMCompatibilityCheck: Path: /Library/StartupItems/NUMCompatibilityCheck
          SymDCInit: Path: /Library/StartupItems/SymDCInit
          TrackDelete: Path: /Library/StartupItems/TrackDelete
          VolumeAssist: Path: /Library/StartupItems/VolumeAssist
Launch Daemons:
          [System] com.adobe.fpsaud.plist 3rd-Party support link
          [System] com.barebones.authd.plist 3rd-Party support link
          [System] com.bombich.ccc.scheduledtask.806652FC-A0D3-423B-B349-8DF1C01ECCBD.plist 3rd-Party support link
          [System] com.bombich.ccc.scheduledtask.DE400061-A39F-4691-861A-7F9DB4E6BF67.plist 3rd-Party support link
          [System] com.fitbit.galileod.plist 3rd-Party support link
          [System] com.google.keystone.daemon.plist 3rd-Party support link
          [System] com.microsoft.office.licensing.helper.plist 3rd-Party support link
Launch Agents:
          [System] com.google.keystone.agent.plist 3rd-Party support link
          [System] com.hp.devicemonitor.plist 3rd-Party support link
          [System] com.hp.messagecenter.launcher.plist 3rd-Party support link
User Launch Agents:
          [not loaded] com.spotify.webhelper.plist 3rd-Party support link
User Login Items:
          SymSecondaryLaunch
          Google Updater Helper
Internet Plug-ins:
          DirectorShockwave: Version: 11.5.8r612 3rd-Party support link
          o1dbrowserplugin: Version: 5.1.7.17873 3rd-Party support link
          Google Earth Web Plug-in: Version: 6.1 3rd-Party support link
          Flip4Mac WMV Plugin: Version: 2.1.0.33 3rd-Party support link
          Silverlight: Version: 5.1.20513.0 - SDK 10.6 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
          DivXBrowserPlugin: Version: 2.0 3rd-Party support link
          Flash Player: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
          iPhotoPhotocast: Version: 6.0
          googletalkbrowserplugin: Version: 5.1.7.17873 3rd-Party support link
          npgtpo3dautoplugin: Version: 0.1.44.29 - SDK 10.5 3rd-Party support link
          AdobePDFViewer: Version: 9.5.1 3rd-Party support link
          CANONiMAGEGATEWAYDL: Version: 3.1.0.2 3rd-Party support link
          QuickTime Plugin: Version: 7.7.1
          SharePointBrowserPlugin: Version: 14.3.2 - SDK 10.6 3rd-Party support link
          JavaAppletPlugin: Version: 14.3.0 - SDK 10.8 Outdated! Update
Audio Plug-ins:
          AirPlay: Version: 1.7 - SDK 10.8
          iSightAudio: Version: 7.7.1 - SDK 10.8
iTunes Plug-ins:
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.8
3rd Party Preference Panes:
          Flash Player 3rd-Party support link
          Flip4Mac WMV 3rd-Party support link
          Growl 3rd-Party support link
          Norton FileSaver
Old Applications:
          /Library/Application Support/Microsoft/MERP2.0
                    Microsoft Error Reporting:          Version: 2.2.9 - SDK 10.4 3rd-Party support link
                    Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4 3rd-Party support link
          Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4 3rd-Party support link
                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
Time Machine:
          Skip System Files: NO
          Auto backup: YES
          Volumes being backed up:
                    Macintosh HD: Disk size: 464.96 GB Disk used: 50.22 GB
          Destinations:
                    Time Machine Backups [Local] (Last used)
                    Total size: 0 B
                    Total number of backups: 0
                    Size of backup disk: Too small
                              Backup size 0 B < (Disk used 50.22 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
          /sbin excluded from backup!
          /usr excluded from backup!
          /System excluded from backup!
          /bin excluded from backup!
          /private excluded from backup!
          /Library excluded from backup!
          /Applications excluded from backup!
Top Processes by CPU:
               7%          Finder
               7%          WindowServer
               6%          Google Chrome
               1%          hidd
               1%          EtreCheck
Top Processes by Memory:
          156 MB          Google Chrome
          102 MB          mds
          52 MB          Google Chrome Helper
          41 MB          WindowServer
          41 MB          Finder
Virtual Memory Information:
          1.35 GB          Free RAM
          1.22 GB          Active RAM
          248 MB          Inactive RAM
          1.19 GB          Wired RAM
          2.01 GB          Page-ins
          0 B          Page-outs

Hey paoloac,
Thanks for the question. I understand that you are experiencing issues with your MacBook. The following resource may provide a solution:
OS X Mountain Lion: If your Mac runs slowly
http://support.apple.com/kb/PH10798
Thanks,
Matt M.

ITunes jammed and now my laptop is very slow

I recently bought a new laptop and a new IPod Photo 30GB. I installed ITunes. I immediatly started to import my cd collection. After two houres of work, my ITunes blocked and I needed to reboot the pc. Since then, my laptop is very slow on startup. What can I do?

Well how much hard disk space is left on your laptop?
If it's > 80% full, it will be slow.
You can try to defrag the hard drive and see if it helps.

My Apple TV is suddenly very slow

I am going to have to use laymen terms here. I purchased my Apple TV a year ago and have been using it successful since. About two weeks ago it suddenly began streaming very slowly and has maintained a very slow rate of transfer between my computer (Windows XP) and the Apple TV. To be frank I cannot use it without frustration. I tried upgrading to 2.0 but it did not help. So I did a factory reset which only put it back on 1.1 ; but the performance is still painful. I have made no changes to my router (ADSL) or my computer that is running iTunes. I have three other laptops that are running on the wireless laptop and they are running fast and fine.
Can anyone help?

davidwh1,
I may have misread your original post... but I interpreted your message to say that you have your information on a laptop, and that the laptop and AppleTV are both connected wirelessly to your router. And if that is the case you can connect your laptop directly to your AppleTV for testing purposes. However, if your iTunes is on your desktop PC, perhaps you could try to sync one of your laptops (if you have iTunes on it) to your AppleTV in order to rule out that it is a connection issue. Sorry if I misread your post and I wish you good luck.
Dave
(aka Bannon)

JDeveloper IDE suddenly very slow for past two days

Hi All,
I have Jdeveloper 11.1.1.4 for more than a month now. Suddenly the JDeveloper IDE has become very slow. It is very annoying having to wait for the code changes to show across and windows take long to get in sync. I have 3.25 GB RAM running on XP service pack 3. Also, I scanned my machine for likely virus, but has come clean. It is only with Jdeveloper I am having problems. All other applications are running fine. I even tried just running JDeveloper alone. No luck.
Thanks

Suddenly the JDeveloper IDE has become very slowSeems like something changed.
Did you install any new extensions? When is it "slow?" Is it when doing a specific activity, or just overall "slow?" What does your OS show (is JDev using lots of CPU, for example)? Have you tried making a backup of your "system11.1.1.4.37.59.23" folder (numbers may be different depending on version) and then deleting it so that JDev recreates it for you (you'll lose all of your preferences/settings)?
John

Internet suddenly very slow 2011 Mac Mini

My internet has suddenly become very very slow.
Wireless.
Last week very fast.
Any ideas?

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar at the top of the screen.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
☞ The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
☞ Some private information, such as your name, may appear in the log. Anonymize before posting.

Macbook suddenly very slow

Hi All,
A couple of days ago, my aluminum macbook suddenly slowed to a crawl. Lots of beach balls, or just freezes with no indication as to why. In addition, certain applications (iTunes, Disk Utility,...) would crash, with crash reporter giving a KERNINVALIDADDRESS error code. I also ran into an error message in Terminal that the dylib shared cache was corrupted, and I wasn't able to rebuild it. I reinstalled OS X, which fixed the dylib and crashing issues, but the computer is still very slow. I've run memtester to investigate whether the RAM is faulty, but didn't find any problems. Disk Utility didn't find any problems with my HD either. Any other suggestions?
Thanks!

HI,
Make sure there's enough free space on the startup disk. Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure you always have a minimum of 15% free disk space.
And help here for the The Spinning Beach Ball of Death
Carolyn

Mac suddenly very slow

All of a sudden my mac started running very slow.
first i opened activity-monitor to see what was wrong. I didnt see any unusual ram-usage. But the kernel_task had a CPU-time of 32 000. I cant seem to find any other explenation for why this is happening.
when i try to use my computer pretty much every task takes ages. Everything from doing stuff on the internet to browsing around in finder. Im also having trouble starting up my computer, i have to hold in the power button very long for it to respond. It also turns itself of without any reason.
Whats weird though is that my computer still manages to run movies in VLC smoothly.
Help would realy be appriciated

Hi dannyboy_123,
I have an article for you here that should be able to help you troubleshoot this issue with your Mac:
OS X Mavericks: If your Mac runs slowly
http://support.apple.com/kb/PH13895
Thanks for being a part of the Apple Support Communities!
Cheers,
Braden

Suddenly VERY Slow Internet On Macbook Pro

My MacBook Pro is less than a year old, running Snow Leopard 10.6.7. A few days ago, the internet suddenly became very, VERY slow. My computer says it is receiving a full signal, and my girlfriend's computer (a Dell, I might add) is on the same wireless network and is working great. I have tried everything suggested to me when searching for the problem online: I've reset my router and modem (but again, my girlfriend's computer is working well on the very same connection and my MacBook claims to be getting a full signal), checked for software updates, emptied Safari's cache, reset Safari, disabled plug-ins, tried Chrome and Firefox (the problem persisted), scanned for a DNS changer and viruses/spyware (the scan came up clean), added open DNS servers, reset my TRAM, repeaired disk permissions and have restarted throughout this process. I cannot trace this changed internet speed to anything - I have no idea what has caused it or how to fix it. Please help!

Hi...
Try Starting up in Safe Mode
That deletes system caches that may help. A Safe Mode boot takes longer then a normal boot so be patient.
Once you see the Desktop click the Apple menu icon top left corner of your screen. From the drop down menu click Restart.
If that didn't help, try uninstalling Sophos > http://help.bol.ucla.edu/app/answers/detail/a_id/879
Then try your browsers. It could be the security software that's slowing your browsers down.
If that helps, you could try a different anti virus software such as ClamXav. It's free and Lion v10.7 compatible.

Suddenly very slow export

Hi. Basically, my export has gone very slow. I will give what details I can, but the main thing here is that I am doing what I have always done, but suddenly it is going very slow. I export to MPEG2 DVD as that goes straight onto a DVD without further render in my Sony DVD maker program. Export in Premiere usually takes between 30 and 40 minutes. Latyest project is warning me of over 3 hours! I thought I would ask here before waiting and seeing if it still works okay in case there is an obvious answer. MPEG audio, multiplexer on, maximum mrender depth, CBR slider set to make a file that will be as large to preserve quality and still fit on a DVD (I go for around 4GB or just over) Stick to CBR as the estimated file size is more accurate than messing about with VBR sliders. Projects are standard definition, two video sources mixed (full DV) and separate sound source added and synchronised. I film stage plays with two cameras. Projects typically between one and a half and two and a half hours long. This project is actually at the lower end. No other obvious problems with the PC in general. Is it worth a system restore? It was fine for a project similar size rendered last week. I am asking befoire i try system restore as they are getting hard to do. They never seem to work unless I remove all my virus protection stuff! CAn I think of anything different about this project? Well, only that the venue I was filming in was not quite level, resulting in a bit of an angle that I corrected by tilting the film just a few degrees. (Only affecting the part of the picture that would be off the TV screen) just to make the stage look level. I often do this with a few shots from one of the cameras, but maybe not the whole film for both cameras like in this case. I even tried pressing enter and doing that render thingy before export. That did not help. Maybe that is just to get something better in the preview window. Normally it just takes around half an hour or just over. Media player can be a bit crackly and choppy playing the rendered movie, but then it is always fine on the DVD so I just put that down to windows media playing being a bit rubbish and not important in my case. Sorry if I have neglected to tell you anything important. I usually get told off for this on this forum, but I have tried to give you details about the settings I am using. The main thing is that I am only doing what I usually do. If I was exporting to a different format I might expect a different time. I can tell you that I got bored waiting and cancelled a few times before coming on here. A couple of times the screen went very white and said windows would close the problemn and notify me of any solution. Program closed but no useful information (I would not really have expected Windows to give me any!). Maybe someone here can? I suppose I had better wait for the three hours or more and at least see what comes out, but cant help being scared it will freeze at 37.34 percent and I will give up after waiting three weeks! But any suggestions would be helpful. Sorry not very tech-savvy so please keep it to plain English. Thanks in advance

Without knowing your computer specs, hard to comment on how long an export ought to take. However, you said yourself that you may have applied rotation to much of the video, and perhaps that is slowing things down from normal.
Please check that your hard drives are defragged and are not getting more than 70-80% full as performance can quickly degrade. I would turn OFF the "Max Bit Depth" and "Max Render Quality" if being used. Should not be needed for DV clips going to DVD. As for pre-rendering the timeline, not recommended. This just adds another layer of compression (quality loss) to the final render, IF you check "Use Previews" in the Export area. If not using Previews, then it is all getting re-rendered anyways, so just a waste of time and drive space really, unless playback is so terrible that you want to render a section to check the results before exporting.
I notice you have MultiPlexing ON for the export - is that how the Sony DVD software wants it? Most authoring programs (like Encore) perform better with separate elements of audio and video, meaning the .wav and .m2v files. Reason being that the DVD program will usually be creating Dolby (AC3) audio for the final DVD, so if you feed it the raw elements, it can convert the .wav to .ac3 quickly, and will NOT need to transcode the video. If you Mux (combine) the audio and video, the audio has then been compressed to lossy MPEG audio, then the DVD software needs to separate the audio and video and re-encode them again in most cases. Not the best workflow. Unless your final DVD uses MPEG audio, but I'm not sure that is a legal part of the spec worldwide, is normally PCM or AC3 for player compatibility.
Not a big fan of anti-virus programs, have found many of the popular ones to really take over and bog down the system. Personally, I use and recommend the free solution of Microsoft Security Essentials. My computer, and those of my kids, have been virus-free the last couple of years since going to that solution, and I see no decrrease in performance and it runs in the background totally transparent to me.
Regards,
Jeff Pulera
Safe Harbor Computers

MacBook Pro Kernel_Task over 300% ; laptop running very slow

My new (4 week old) MacBook Pro suddenly this weekend started running very slow with the fan running constantly. I found the "kernel_task" was running the CPU over 300%. I tried various methods mentioned in different threads but nothing worked. I eventually went all the way to wiping the disk and reinstalling the OS. This has NOT fixed the problem. I do not know where to go next. I am posting a copy of the EtreCheck report I ran, and I am looking for any help.
The next step is taking this thing back to the Apple store. I love my MacBook, but not when it is not lagging like something running Windows ME. I expected more out of this machine than this.
EtreCheck Report:
EtreCheck version: 1.9.11 (43) - report generated June 5, 2014 at 9:53:46 PM CDT
Hardware Information:
          MacBook Pro (Retina, 13-inch, Late 2013)
          MacBook Pro - model: MacBookPro11,1
          1 2.6 GHz Intel Core i5 CPU: 2 cores
          8 GB RAM
Video Information:
          Intel Iris - VRAM: (null)
System Software:
          OS X 10.9.3 (13D65) - Uptime: 4 days 4:34:59
Disk Information:
          APPLE SSD SM0512F disk0 : (500.28 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    MacHD (disk0s2) / [Startup]: 499.42 GB (487.46 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Internal Memory Card Reader
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Gatekeeper:
          Mac App Store and identified developers
User Login Items:
          None
Internet Plug-ins:
          Default Browser: Version: 537 - SDK 10.9
          QuickTime Plugin: Version: 7.7.3
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 2.0 - SDK 10.9
          AppleAVBAudio: Version: 203.2 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
          None
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               6%          WindowServer
               2%          hidd
               1%          Dock
               0%          com.apple.WebKit.Networking
               0%          mds_stores
Top Processes by Memory:
          188 MB          Safari
          165 MB          com.apple.WebKit.WebContent
          66 MB          WindowServer
          49 MB          Finder
          41 MB          com.apple.WebKit.Networking
Virtual Memory Information:
          4.96 GB          Free RAM
          1.64 GB          Active RAM
          387 MB          Inactive RAM
          849 MB          Wired RAM
          770 MB          Page-ins
          0 B          Page-outs

The kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to
a buildup of dust on the logic board
high ambient temperature
a worn-out or faulty battery in a portable
the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on battery power, the fault is in the battery or the logic board. If it happens only on AC power, charging is causing the machine to heat up. That may be normal on some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models while the lid is open may cause this issue. If applicable, test by closing the lid or disconnecting the display. You might get better results with a newer LED display.

Laptop suddenly very slow

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