This is a fairly recent issue and nothing has changed in my usage habits. I have only a few apps running and memory has always been sufficient. EtreCheck log:
EtreCheck version: 2.9.11 (264)
Report generated 2016-04-27 17:01:26
Download EtreCheck from https://etrecheck.com
Runtime 6:58
Performance: Below Average
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Other problem
Description:
hard drive works for a long time several times a day
Hardware Information: ⓘ
iMac (27-inch, Mid 2010)
[Technical Specifications] - [User Guide] - [Warranty & Service]
iMac - model: iMac11,3
1 3.2 GHz Intel Core i3 CPU: 2-core
4 GB RAM
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
BANK 0/DIMM1
Empty
BANK 1/DIMM1
Empty
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: Unknown
Video Information: ⓘ
ATI Radeon HD 5670 - VRAM: 512 MB
iMac 2560 x 1440
System Software: ⓘ
OS X Mountain Lion 10.8.5 (12F2560) - Time since boot: about 11 days
Disk Information: ⓘ
OPTIARC DVD RW AD-5680H ()
APPLE HDD HUA722010CLA330 disk0 : (1 TB) (Rotational)
disk0s1 (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (759.26 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ⓘ
Lexmark 2600 Series
Apple, Inc. Keyboard Hub
Apple Inc. Apple Keyboard
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Internal Memory Card Reader
Microsoft Compact Optical Mouse 500
Apple Inc. Built-in iSight
Apple Computer, Inc. IR Receiver
Gatekeeper: ⓘ
Mac App Store and identified developers
Kernel Extensions: ⓘ
/Applications/Parallels Desktop.app
[loaded] com.parallels.kext.hidhook (8.0 18619.1001606 - 2014-09-24) [Support]
[loaded] com.parallels.kext.hypervisor (8.0 18619.1001606 - 2014-09-24) [Support]
[loaded] com.parallels.kext.netbridge (8.0 18619.1001606 - 2014-09-24) [Support]
[loaded] com.parallels.kext.usbconnect (8.0 18619.1001606 - 2014-09-24) [Support]
[loaded] com.parallels.kext.vnic (8.0 18619.1001606 - 2014-09-24) [Support]
/System/Library/Extensions
[not loaded] com.devguru.driver.PTUMWDrv (1.2.40314.524 - 2016-04-04) [Support]
[not loaded] com.novatelwireless.driver.3G (v3.0.7 (001) - 2016-04-04) [Support]
[not loaded] com.novatelwireless.driver.DisableAutoInstall (v2.0.6 - 2016-04-04) [Support]
[not loaded] com.rim.driver.BlackBerryUSBDriverInt (0.0.52 - 2016-04-04) [Support]
[not loaded] com.rim.driver.BlackBerryUSBDriverVSP (0.0.45 - 2016-04-04) [Support]
[not loaded] com.sierrawireless.driver.SierraDevSupport (2.0.2.0 - 2016-04-04) [Support]
[not loaded] com.sierrawireless.driver.SierraFSCSupport (2.0.2.0 - 2016-04-04) [Support]
[not loaded] com.sierrawireless.driver.SierraFSRSupport (2.0.2.0 - 2016-04-04) [Support]
[not loaded] com.sierrawireless.driver.SierraHSRSupport (2.0.2.0 - 2016-04-04) [Support]
[not loaded] com.smithmicro.driver.SMSIWirelessModem (3.2.7 - 2016-04-04) [Support]
/System/Library/Extensions/NovatelWireless3G.kext/Contents/Plugins
[not loaded] com.novatelwireless.driver.3GData (v3.0.7 (001) - 2010-07-26) [Support]
/System/Library/Extensions/PTUMWDrv.kext/Contents/PlugIns
[not loaded] com.devguru.driver.PTUMWCDFree (1.2.40314.524 - 2010-07-26) [Support]
[not loaded] com.devguru.driver.PTUMWCSP (1.2.40314.524 - 2010-07-26) [Support]
[not loaded] com.devguru.driver.PTUMWDIAG (1.2.40314.524 - 2010-07-26) [Support]
[not loaded] com.devguru.driver.PTUMWMdmControl (1.2.40314.524 - 2010-07-26) [Support]
[not loaded] com.devguru.driver.PTUMWMdmData (1.2.40314.524 - 2010-07-26) [Support]
[not loaded] com.devguru.driver.PTUMWUSBMergeNub (1.2.40314.524 - 2010-07-26) [Support]
/System/Library/Extensions/SMSIWirelessModem.kext/Contents/PlugIns
[not loaded] com.smithmicro.driver.SMSIWirelessCDC (3.2.7 - 2010-07-26) [Support]
[not loaded] com.smithmicro.driver.SMSIWirelessSerial (3.2.7 - 2010-07-26) [Support]
System Launch Agents: ⓘ
[failed] com.apple.coreservices.appleid.authentication.plist
[failed] com.apple.pbs.plist
[failed] com.apple.printtool.agent.plist
[failed] com.apple.tccd.plist
[not loaded] 4 Apple tasks
[loaded] 116 Apple tasks
[running] 20 Apple tasks
System Launch Daemons: ⓘ
[failed] com.apple.coresymbolicationd.plist
[not loaded] 54 Apple tasks
[loaded] 129 Apple tasks
[running] 50 Apple tasks
Launch Agents: ⓘ
[not loaded] com.adobe.AAM.Updater-1.0.plist (2010-10-30) [Support]
[loaded] com.adobe.CS5ServiceManager.plist (2010-10-30) [Support]
[loaded] com.google.keystone.agent.plist (2016-03-02) [Support]
[failed] com.kaspersky.kav.gui.plist (2016-04-16) [Support]
[loaded] com.oracle.java.Java-Updater.plist (2015-12-13) [Support]
[running] com.rim.BBLaunchAgent.plist (2010-12-17) [Support]
Launch Daemons: ⓘ
[loaded] com.adobe.SwitchBoard.plist (2010-10-30) [Support]
[loaded] com.adobe.fpsaud.plist (2016-04-15) [Support]
[loaded] com.google.keystone.daemon.plist (2016-03-02) [Support]
[running] com.kaspersky.kav.plist (2016-04-16) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2010-08-25) [Support]
[loaded] com.oracle.java.Helper-Tool.plist (2015-12-13) [Support]
[running] com.rim.BBDaemon.plist (2010-12-17) [Support]
User Launch Agents: ⓘ
[loaded] com.adobe.AAM.Updater-1.0.plist (2010-10-31) [Support]
[loaded] com.adobe.ARM.[...].plist (2010-11-27) [Support]
[failed] com.amazon.cloud-player.plist (2013-10-31) [Support]
[loaded] com.apple.AddressBook.ScheduledSync.PHXC...plist
[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (2014-06-20) [Support]
User Login Items: ⓘ
Calendar Application (/Applications/Calendar.app)
HughesNet Status Meter 08-11-07-817 Application Hidden (~/.Trash/HughesNet Status Meter 08-11-07-817.app)
HughesNet Status Meter Application Hidden (/Applications/HughesNet Status Meter.app)
Other Apps: ⓘ
[loaded] 0x7f986ac05610.mach_init.kav
[running] [0x0-0x12012].com.lexmark.icadriver
[running] [0x0-0x13013].jp.co.canon.cijscannerregister
[running] [0x0-0x1f01f].com.hughesnet.statusmeter
[running] [0x0-0x20020].com.hughesnet.statusmeter
[running] [0x0-0x53053].com.adobe.PDApp.AAMUpdatesNotifier
[running] [0x0-0xa80a8].com.parallels.desktop.console
[running] [0x0-0xafdafd].com.parallels.winapp.1d3796c3a6275e3a8a574be6716ab605.8a36ee5c3d a74461ad1f9fd7074393d3.fs
[running] [0x0-0xc70c70].com.etresoft.EtreCheck
[loaded] 377 Apple tasks
[running] 142 Apple tasks
Internet Plug-ins: ⓘ
Google Earth Web Plug-in: 7.1 (2013-10-07) [Support]
OfficeLiveBrowserPlugin: 12.3.5 (2012-11-24) [Support]
AdobePDFViewerNPAPI: 10.1.16 (2015-10-15) [Support]
FlashPlayer-10.6: 21.0.0.226 - SDK 10.6 (2016-04-25) [Support]
Silverlight: 5.1.41212.0 - SDK 10.6 (2016-03-11) [Support]
QuickTime Plugin: 7.7.1 (2015-08-19)
Flash Player: 21.0.0.226 - SDK 10.6 (2016-04-25) [Support]
iPhotoPhotocast: 7.0 (2011-01-12)
SharePointBrowserPlugin: 14.6.3 - SDK 10.6 (2016-04-21) [Support]
AdobePDFViewer: 10.1.16 (2015-10-15) [Support]
CouponPrinter-FireFox_v2: Version 1.1.9 - SDK 10.5 (2012-11-20) [Support]
JavaAppletPlugin: Java 8 Update 91 build 14 (2016-04-21) Check version
User internet Plug-ins: ⓘ
CitrixOnlineWebDeploymentPlugin: 1.0.105 (2014-09-16) [Support]
WebEx: 1.0 (2011-02-08) [Support]
Safari Extensions: ⓘ
BB Toolbar for Google and Safari - BB Share Networking Inc. - http://www.bbshare.com (2016-02-24)
OpenIE - Parallels - http://www.parallels.com (2014-09-22)
3rd Party Preference Panes: ⓘ
Flash Player (2016-04-15) [Support]
Growl (2011-06-03) [Support]
Java (2016-04-21) [Support]
MacFUSE (2011-07-16) [Support]
Time Machine: ⓘ
Skip System Files: NO
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 999.35 GB Disk used: 240.08 GB
Destinations:
Time Machine Backups [Local]
Total size: 749.78 GB
Total number of backups: 21
Oldest backup: 1/9/16 5:25 PM
Last backup: 4/23/16 12:56 PM
Size of backup disk: Adequate
Backup size 749.78 GB > (Disk used 240.08 GB X 3)
Top Processes by CPU: ⓘ
22% firefox
10% mDNSResponder
8% configd
5% WindowServer
4% prl_vm_app
Top Processes by Memory: ⓘ
1008 MB firefox
877 MB prl_vm_app
53 MB prl_client_app
53 MB HughesNet Status Meter(2)
49 MB plugin-container
Virtual Memory Information: ⓘ
112 MB Free RAM
3.89 GB Used RAM
3.27 GB Swap Used
Diagnostics Information: ⓘ
Apr 27, 2016, 03:29:14 PM /Library/Logs/DiagnosticReports/ksfetch_2016-04-27-152914_[redacted].crash
/private/tmp/*/ksfetch
Apr 26, 2016, 09:13:28 PM /Library/Logs/DiagnosticReports/ksfetch_2016-04-26-211328_[redacted].crash
Apr 25, 2016, 11:08:09 PM /Library/Logs/DiagnosticReports/ksfetch_2016-04-25-230809_[redacted].crash
Apr 25, 2016, 11:06:24 PM /Library/Logs/DiagnosticReports/ksfetch_2016-04-25-230624_[redacted].crash
Apr 25, 2016, 09:39:51 PM ~/Library/Logs/DiagnosticReports/plugin-container_2016-04-25-213951_[redacted]. crash
org.mozilla.plugincontainer - /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/pl ugin-container
Apr 25, 2016, 04:07:46 AM /Library/Logs/DiagnosticReports/ksfetch_2016-04-25-040746_[redacted].crash