Omdat mijn iMac (27 inch, mid 2010) tergend traag is (vooral met opstarten), heb ik een EtreCheck gedraaid. Dat leverde een paar rode regels op in het rapport.

System Launch Agents: ⓘ
   [not loaded]    9 Apple tasks
   [loaded]    162 Apple tasks
   [running]    105 Apple tasks
  [killed]    6 Apple tasks
   6 processes killed due to insufficient RAM

System Launch Daemons: ⓘ
   [failed]    com.apple.postfix.master.plist (Apple, Inc. - installed 2017-03-23)
   [not loaded]    40 Apple tasks
   [loaded]    166 Apple tasks
   [running]    103 Apple tasks
  [killed]    9 Apple tasks
   9 processes killed due to insufficient RAM

Er zit nu 8 GB 1333 MHz DDR3 in mijn iMac. Het lijkt me goed om dat uit te breiden naar 16 GB. Dat kan volgens de Apple site (https://support.apple.com/en-us/HT201191).

Graag zou ik advies hebben welk geheugen ik zou kunnen kopen en waar. Ik zie enorme prijsverschillen en zo op het oog ook heel verschillende kaartjes....

Vast hartelijk dank!

Jouw RAM probleem los je op door meer geheugen bij te plaatsen, of door overbodige zaken te verwijderen. Plaats eens je hele EtreCheck rapport.

Bij deze:

EtreCheck version: 3.4.5 (455)
Report generated 2017-09-29 16:34:50
Download EtreCheck from https://etrecheck.com
Runtime: 4:44
Performance: Good

Click the [Lookup] links for more information from Apple Support Communities.
Click the [Details] links for more information about that line.

Problem: Computer is too slow

Hardware Information: ⓘ
   iMac (27-inch, Mid 2010)
   [Technical Specifications] - [User Guide] - [Warranty & Service]
   iMac - model: iMac11,3
   1 2,8 GHz Intel Core i5 (i5) CPU: 4-core
   8 GB RAM Upgradeable - [Instructions]
       BANK 0/DIMM0
           2 GB DDR3 1333 MHz ok
       BANK 1/DIMM0
           2 GB DDR3 1333 MHz ok
       BANK 0/DIMM1
           2 GB DDR3 1333 MHz ok
       BANK 1/DIMM1
           2 GB DDR3 1333 MHz ok
   Handoff/Airdrop2: not supported
   Wireless:  en1: 802.11 a/b/g/n
   iCloud Quota: 29.70 GB available

Video Information: ⓘ
   ATI Radeon HD 5750 - VRAM: 1024 MB
       iMac 2560 x 1440

Disk Information: ⓘ
   ST31000528AS disk0: (1 TB) (Rotational)
   [Show SMART report]
       EFI (disk0s1 - MS-DOS FAT32) <not mounted>  [EFI]: 210 MB
       Macintosh HD (disk0s2 - Journaled HFS+) /  [Startup]: 999.35 GB (472.69 GB free)
       Recovery HD (disk0s3 - Journaled HFS+) <not mounted>  [Recovery]: 650 MB

   OPTIARC DVD RW AD-5680H  ()

USB Information: &#9432;
    USB20Bus
        hub_device
           Apple, Inc. Keyboard Hub
               Apple, Inc Apple Keyboard
           Logitech USB Receiver
           Apple Computer, Inc. IR Receiver
           Apple Inc. Built-in iSight
    USB20Bus
        hub_device
            hub_device
               Elgato EyeTV Hybrid
           Seagate BUP Slim SL
               BUP Slim SL disk1: (2 TB)
                   EFI (disk1s1 - MS-DOS FAT32) <not mounted>  [EFI]: 210 MB
                   LeaTM (disk1s2 - Journaled HFS+) /Volumes/LeaTM : 2.00 TB (911.71 GB free)
           Apple Card Reader
           Apple Inc. BRCM2046 Hub
               Apple Inc. Bluetooth USB Host Controller

Virtual disks: &#9432;
   calibre-3.8.0 (disk2s1 - HFS+) /Volumes/calibre-3.8.0 : 267 MB (51 MB free)
       Physical disk: Disk Image 267 MB (51 MB free)

System Software: &#9432;
   macOS Sierra  10.12.6 (16G29) - Time since boot: about 18 days

Gatekeeper: &#9432;
   Mac App Store and identified developers

Kernel Extensions: &#9432;
       /Library/Application Support/Citrix Receiver
   [not loaded]    com.citrix.kext.gusb (12.7.0 - SDK 10.9) [Lookup]

       /Library/Extensions
   [loaded]    com.Logitech.Control Center.HID Driver (3.9.3 - SDK 10.8) [Lookup]
   [loaded]    com.Logitech.Unifying.HID Driver (1.3.3 - SDK 10.8) [Lookup]
   [loaded]    com.karios.driver.DuetDisplay (1.1.2 - SDK 10.10) [Lookup]

       /System/Library/Extensions
   [loaded]    com.Cycling74.driver.Soundflower (1.5.3 - SDK 10.6) [Lookup]
   [not loaded]    com.Greatdy.driver.SystemAudioCapture (1.0.0 - SDK 10.6) [Lookup]
   [not loaded]    com.elgato.driver.DontMatchAfaTech (1.1) [Lookup]
   [not loaded]    com.elgato.driver.DontMatchCinergy450 (1.1) [Lookup]
   [not loaded]    com.elgato.driver.DontMatchCinergyXS (1.1) [Lookup]
   [not loaded]    com.elgato.driver.DontMatchEmpia (1.1) [Lookup]
   [not loaded]    com.elgato.driver.DontMatchVoyager (1.1) [Lookup]
   [loaded]    com.globaldelight.driver.BoomDevice (1.1 - SDK 10.9) [Lookup]
   [not loaded]    com.nike.sportwatch (1.0.0) [Lookup]
   [not loaded]    com.tomtom.driver.UsbEthernetGadget (1.0.0d1) [Lookup]
   [not loaded]    com.wacom.kext.pentablet (Pen Tablet 5.2.1-3) [Lookup]

System Launch Agents: &#9432;
   [not loaded]    9 Apple tasks
   [loaded]    162 Apple tasks
   [running]    105 Apple tasks
   [killed]    6 Apple tasks
   6 processes killed due to insufficient RAM

System Launch Daemons: &#9432;
   [failed]    com.apple.postfix.master.plist (Apple, Inc. - installed 2017-03-23)
   [not loaded]    40 Apple tasks
   [loaded]    166 Apple tasks
   [running]    103 Apple tasks
   [killed]    9 Apple tasks
   9 processes killed due to insufficient RAM

Launch Agents: &#9432;
   [running]    com.Logitech.Control Center.Daemon.plist (Logitech Inc. - installed 2016-10-01) [Lookup]
   [not loaded]    com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2014-07-09) [Lookup]
   [loaded]    com.citrix.AuthManager_Mac.plist (? b095ca60 9db56088 - installed 2017-09-29) [Lookup]
   [running]    com.citrix.ReceiverHelper.plist (? bbfad3f1 d2b20767 - installed 2017-09-29) [Lookup]
   [running]    com.citrix.ServiceRecords.plist (? 8e6543d 3d69aba9 - installed 2017-09-29) [Lookup]
   [loaded]    com.google.keystone.agent.plist (Google, Inc. - installed 2017-07-10) [Lookup]
   [loaded]    com.hp.help.tocgenerator.plist (? 11d191c4 72629491 - installed 2011-12-17) [Lookup]
   [running]    com.nike.nikeplusconnect.plist (Nike, Inc./ - installed 2014-09-28) [Lookup]
   [not loaded]    com.oracle.java.Java-Updater.plist (? 0 ? - installed (null)) [Lookup]
   [not loaded]    com.teamviewer.teamviewer.plist (? 730ef1da a2b71f5f - installed 2013-11-15) [Lookup]
   [not loaded]    com.teamviewer.teamviewer_desktop.plist (? 5b530c10 c6847e3a - installed 2013-09-12) [Lookup]
   [failed]    com.wacom.pentablet.plist (? ace6eaba b53b5fd3 - installed 2011-11-28) [Lookup]

Launch Daemons: &#9432;
   [loaded]    com.citrix.ctxusbd.plist (? 44dc9c9f a799375a - installed 2017-09-22) [Lookup]
   [loaded]    com.google.keystone.daemon.plist (Google, Inc. - installed 2017-07-27) [Lookup]
   [loaded]    com.malwarebytes.HelperTool.plist (Malwarebytes Corporation - installed 2017-05-18) [Lookup]
   [loaded]    com.malwarebytes.MBAMHelperTool.plist (Malwarebytes Corporation - installed 2015-12-03) [Lookup]
   [running]    com.microsoft.autoupdate.helper.plist (Microsoft Corporation - installed 2016-12-17) [Lookup]
   [loaded]    com.microsoft.office.licensing.helper.plist (? 6d8cb30e afb3bef0 - installed 2010-09-28) [Lookup]
   [loaded]    com.microsoft.office.licensingV2.helper.plist (Microsoft Corporation - installed 2015-09-11) [Lookup]
   [not loaded]    com.oracle.java.Helper-Tool.plist (? 0 ? - installed (null)) [Lookup]
   [loaded]    com.rogueamoeba.instanton-agent.plist (Rogue Amoeba Software, LLC - installed 2014-11-29) [Lookup]
   [loaded]    com.skype.skypeinstaller.plist (Skype - installed 2014-09-19) [Lookup]
   [not loaded]    com.teamviewer.teamviewer_service.plist (? 4d262d27 17048a9c - installed 2013-09-12) [Lookup]
   [loaded]    com.westerndigital.WD-SmartWare-Installer.plist (Western Digital Corporation Branded Products Group - installed 2015-10-20) [Lookup]

User Launch Agents: &#9432;
   [loaded]    com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-11) [Lookup]
   [running]    com.spotify.webhelper.plist (Spotify - installed 2017-09-20) [Lookup]
   [not loaded]    ws.agile.1PasswordAgent.plist (? 1ab1f034 6892db6 - installed 2014-07-11) [Lookup]

User Login Items: &#9432;
   Dropbox    Programma
       (/Applications/Dropbox.app)
   EyeTV Helper    Programma
       (/Library/Application Support/EyeTV/EyeTV Helper.app)

Internet Plug-ins: &#9432;
   WacomNetscape: 1.1.0-4 (installed 2009-10-30) [Lookup]
   Unity Web Player: UnityPlayer version 4.3.5f1 (installed 2014-03-17) [Lookup]
   WacomSafari: 1.1.0-4 (installed 2009-10-30) [Lookup]
   OfficeLiveBrowserPlugin: 12.3.6 (installed 2013-03-27) [Lookup]
   RealPlayer Plugin: Unknown (installed 2010-05-20) [Lookup]
   QuickTime Plugin: 7.7.3 (installed 2017-07-22)
   iPhotoPhotocast: 7.0 (installed 2013-04-17)
   CitrixICAClientPlugIn: 12.7.0 (installed 2017-09-29) [Lookup]
   SharePointBrowserPlugin: 14.6.2 (installed 2016-03-30) [Lookup]
   AdobePDFViewer: 10.1.0 (installed 2012-07-05) [Lookup]
   GarminGpsControl: 4.0.3.0 Release (installed 2012-06-26) [Lookup]
   Scorch: Unknown (installed 2013-10-04) [Lookup]

User internet Plug-ins: &#9432;
   Google Earth Web Plug-in: 7.1 (installed 2013-10-07) [Lookup]

Safari Extensions: &#9432;
   [enabled]    AdBlock - BetaFish, Inc. - https://getadblock.com (installed 2017-08-05)
   [enabled]    Ghostery - GHOSTERY, Inc. - https://www.ghostery.com/ (installed 2016-03-12)
   [enabled]    YouTube5 - Connor McKay - http://www.verticalforest.com/youtube5-extension/ (installed 2014-05-12)
   [enabled]    1Password - AgileBits - https://agilebits.com/onepassword (installed 2017-09-21)

3rd Party Preference Panes: &#9432;
   Logitech Control Center (installed 2016-10-01) [Lookup]

Time Machine: &#9432;
   Skip System Files: NO
   Mobile backups: OFF
   Auto backup: YES
   Volumes being backed up:
       Macintosh HD: Disk size: 999.35 GB Disk used: 526.65 GB
   Destinations:
       LeaTM [Local]
       Total size: 2.00 TB
       Total number of backups: 63
       Oldest backup: 22-02-14 02:48
       Last backup: 29-09-17 15:11
       Size of backup disk: Adequate
           Backup size 2.00 TB > (Disk used 526.65 GB X 3)

Top Processes by CPU: &#9432;
        5%     WindowServer
        4%     backupd
        3%     mdworker
        2%     mdworker
        2%     kernel_task

Top Processes by Memory: &#9432;
   867 MB      kernel_task
   397 MB      Safari
   238 MB      firefox
   237 MB      com.apple.WebKit.WebContent
   207 MB      mds_stores

Top Processes by Network Use: &#9432;
   Input       Output      Process name
   42 MB       2 MB        Dropbox
   9 MB        2 MB        mDNSResponder
   489 KB      132 KB      netbiosd
   465 KB      78 KB       Mail
   10 KB       18 KB       usbmuxd

Top Processes by Energy Use: &#9432;
    28.68  backupd
    13.62  hiutil
     7.62  WindowServer
     3.32  mds

Virtual Memory Information: &#9432;
   1.37 GB     Available RAM
   42 MB       Free RAM
   6.63 GB     Used RAM
   1.33 GB     Cached files
   967 MB      Swap Used

Software installs: &#9432;
   Kindle: 1.20.3 (installed 2017-09-08)
   Evernote: 6.12.1 (installed 2017-09-08)
   Bible Study: 6.0.13 (installed 2017-09-14)
   Citrix Receiver: 12.6.0 (installed 2017-09-14)
   Citrix Receiver: 12.0.0 (installed 2017-09-14)
   Evernote: 6.12.2 (installed 2017-09-17)
   Evernote: 6.12.3 (installed 2017-09-22)
   Citrix Receiver: 12.7.0 (installed 2017-09-29)
   PhotoSweeper: 3.1.0 (installed 2017-09-29)

   Install information may not be complete.

Diagnostics Information: &#9432;
   2017-09-11 01:06:33    Last shutdown cause: -2 - Unknown

Ik zie heel veel drivers van heel veel dingen staan. Kijk eens of je daar iets kunt opruimen, heb je bv nog een TomTom? En gebruik je je Wacom in Netscape of Safari?

Hoe heb je nu 8 GB? Als dat 2 * 4GB is, dan kun je ook 2 * 4GB erbij plaatsen. Bijvoorbeeld deze:
MicroMemory 8GB kit SO-DIMM.

Of, https://www.alternate.nl/html/product/information/page.html?articleId=971986&channel_code=544&ad_id=41451789236&s2m_product_id=IENF58&utm_source=adwords-shopping&s2m_campaign=DEACTIVATED&gclid=EAIaIQobChMIwa7BiZHN1gIVqwrTCh1o6wcdEAQYFiABEgLHaPD_BwE

@MacFrankie: ik heb nu 4 x 2GB.

Over het verwijderen van drivers: is dat een kwestie van het betreffende bestand verwijderen? Of moet daar meer voor gebeuren?

Als die mac vanaf 2010 al word gebruikt en via een jaarlijkse update van Snow Leopard inmiddels op Sierra is beland is er mijns inziens veel meer winst te behalen via een schone installatie dan om geheugen bij te steken en wat oude drivers en launch agents te verwijderen.

Kost misschien even een middag werk, maar heb je weer een heerlijk fris systeem en zul je zie dat die 8GB waarschijnlijk helemaal niet nodig is.

Leja50 om 23:00, 30-09-2017
@MacFrankie: ik heb nu 4 x 2GB.

Dan moet je er 2 vervangen door andere modules, want je hebt 4 geheugenslots.

Leja50 om 23:00, 30-09-2017

Over het verwijderen van drivers: is dat een kwestie van het betreffende bestand verwijderen? Of moet daar meer voor gebeuren?

Het ligt aan het bestand.

Maar ik ben het eens met Nelis00: doe eens een schone installatie!

Maak daarvoor eerst een TimeMachine backup. Start op vanaf je rescue partitie. Wis je interne harde schijf. Installeer macOS. Zet alleen de data terug vanaf je TimeMachine backup, dus niet je programma's.

Ik ga mee met een clean install...

Als dat niet kan, verwijder deze eerst eens:

[loaded] com.westerndigital.WD-SmartWare-Installer.plist (Western Digital Corporation Branded Products Group - installed 2015-10-20) [Lookup]

Gekende oorzaak van traagheid, zeker in combo met dropbox en nog wat oudjes, zoals SoundFlower.