yet another beachball problem

I'm experiencing frequent beachballs on my MBP running 10.9.5. I've read through a bunch of threads describing similar problems, and I've tried many of the fixes suggested there: resetting SMC and PRAM, repairing permissions, freeing up hard drive space, etc. Nothing in activity monitor suggests a problem: disk/network I/O are low and I'm not seeing memory pressure. The console log is unrevealing. About the only thing I haven't tried is a clean install, since that will be terribly difficult as I don't have media/activation keys for a bunch of stuff and it'll take forever to get a working system again.

Here's EtreCheck's output. Any advice would be very welcome.

Problem description:

Beachball

EtreCheck version: 2.2 (132)

Report generated 5/5/15, 4:49 PM

Download EtreCheck from http://etresoft.com/etrecheck

Click the [Click for support] links for help with non-Apple products.

Click the [Click for details] links for more information about that line.

Hardware Information: ℹ️

MacBook Pro (13-inch, Mid 2012) (Technical Specifications)

MacBook Pro - model: MacBookPro9,2

1 2.9 GHz Intel Core i7 CPU: 2-core

16 GB RAM Upgradeable

BANK 0/DIMM0

8 GB DDR3 1600 MHz ok

BANK 1/DIMM0

8 GB DDR3 1600 MHz ok

Bluetooth: Good - Handoff/Airdrop2 supported

Wireless: en1: 802.11 a/b/g/n

Battery: Health = Normal - Cycle count = 31 - SN = W035246UPD3LC

Video Information: ℹ️

Intel HD Graphics 4000

Color LCD 1280 x 720

System Software: ℹ️

OS X 10.9.5 (13F1077) - Time since boot: 18:46:28

Disk Information: ℹ️

APPLE HDD ST1000LM024 disk0 : (1 TB)

EFI (disk0s1) <not mounted> : 210 MB

Macintosh HD (disk0s2) / : 999.35 GB (164.98 GB free)

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

HL-DT-ST DVDRW GS41N disk2 : (3.86 GB)

USB Information: ℹ️

Apple Inc. FaceTime HD Camera (Built-in)

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Computer, Inc. IR Receiver

Thunderbolt Information: ℹ️

Apple Inc. thunderbolt_bus

Configuration files: ℹ️

/etc/hosts - Count: 1

Gatekeeper: ℹ️

Anywhere

Kernel Extensions: ℹ️

/Applications/KisMAC trunk r242.app

[not loaded] de.binaervarianz.driver.AtheroJack (1.1) [Click for support]

[not loaded] org.binaervarianz.iokit.AiroJack (1.0.0d1) [Click for support]

[not loaded] org.binaervarianz.iokit.MACJack (1.0.0a1) [Click for support]

[not loaded] org.theta44.iokit.WLanDriver (0.0.2) [Click for support]

/Applications/zoom.us.app

[not loaded] zoom.us.ZoomAudioDevice (1.1 - SDK 10.8) [Click for support]

/Library/Extensions

[loaded] org.virtualbox.kext.VBoxDrv (4.2.16) [Click for support]

[not loaded] org.virtualbox.kext.VBoxNetAdp (4.2.16) [Click for support]

[not loaded] org.virtualbox.kext.VBoxNetFlt (4.2.16) [Click for support]

[loaded] org.virtualbox.kext.VBoxUSB (4.2.16) [Click for support]

/System/Library/Extensions

[loaded] com.Cycling74.driver.Soundflower (1.6.2 - SDK 10.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWDrv (9.11.6) [Click for support]

[loaded] com.eltima.ElmediaPlayer.kext (1.0) [Click for support]

[loaded] com.globaldelight.driver.BoomDevice (1.1 - SDK 10.9) [Click for support]

[not loaded] com.keyspan.iokit.usb.KeyspanUSAdriver (2.5) [Click for support]

[not loaded] com.novatelwireless.driver.3G (3.0.7) [Click for support]

[not loaded] com.novatelwireless.driver.DisableAutoInstall (2.0.6) [Click for support]

[not loaded] com.sierrawireless.driver.SierraSupport (1.4.11) [Click for support]

[not loaded] com.sierrawireless.driver.SierraSwitch (1.2.2) [Click for support]

[not loaded] com.sierrawireless.driver.SierraSwitchKicker (1.0.0) [Click for support]

/System/Library/Extensions/NovatelWireless3G.kext/Contents/PlugIns

[not loaded] com.novatelwireless.driver.3GData (3.0.7) [Click for support]

/System/Library/Extensions/PTUMWDrv.kext/Contents/PlugIns

[not loaded] com.devguru.driver.PTUMWCDFree (9.11.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWCSP (9.11.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWDIAG (9.11.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWMdmControl (9.11.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWMdmData (9.11.6) [Click for support]

[not loaded] com.devguru.driver.PTUMWNMEA (9.11.6) [Click for support]

Startup Items: ℹ️

Jaksta: Path: /Library/StartupItems/Jaksta

RetroRun: Path: /Library/StartupItems/RetroRun

VirtualBox: Path: /Library/StartupItems/VirtualBox

Wireshark: Path: /Library/StartupItems/Wireshark

Startup items are obsolete in OS X Yosemite

Launch Agents: ℹ️

[loaded] com.cisco.anyconnect.gui.plist [Click for support]

[loaded] com.google.keystone.agent.plist [Click for support]

[running] com.machangout.glims.agent.plist [Click for support]

[loaded] com.oracle.java.Java-Updater.plist [Click for support]

[loaded] org.gpgtools.gpgmail.enable-bundles.plist [Click for support]

[loaded] org.gpgtools.gpgmail.patch-uuid-user.plist [Click for support]

[loaded] org.gpgtools.Libmacgpg.xpc.plist [Click for support]

[loaded] org.gpgtools.macgpg2.fix.plist [Click for support]

[running] org.gpgtools.macgpg2.shutdown-gpg-agent.plist [Click for support]

[loaded] org.gpgtools.macgpg2.updater.plist [Click for support]

[loaded] org.macosforge.xquartz.startx.plist [Click for support]

Launch Daemons: ℹ️

[loaded] com.adobe.fpsaud.plist [Click for support]

[running] com.backblaze.bzserv.plist [Click for support]

[running] com.cisco.anyconnect.vpnagentd.plist [Click for support]

[running] com.eltima.ElmediaPlayer.daemon.plist [Click for support]

[loaded] com.google.keystone.daemon.plist [Click for support]

[running] com.machangout.glims.loader.plist [Click for support]

[loaded] com.microsoft.office.licensing.helper.plist [Click for support]

[loaded] com.oracle.java.Helper-Tool.plist [Click for support]

[loaded] org.gpgtools.gpgmail.patch-uuid.plist [Click for support]

[loaded] org.macosforge.xquartz.privileged_startx.plist [Click for support]

User Launch Agents: ℹ️

[loaded] com.adobe.ARM.[...].plist [Click for support]

[running] com.backblaze.bzbmenu.plist [Click for support]

[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist [Click for support]

[not loaded] org.virtualbox.vboxwebsrv.plist [Click for support]

User Login Items: ℹ️

PhotoSync Application (/Applications/PhotoSync.app)

GrowlHelperApp UNKNOWN (missing value)

AirPort Base Station Agent Application (/System/Library/CoreServices/AirPort Base Station Agent.app)

Google Drive Application Hidden (/Applications/Google Drive.app)

Google Chrome Application Hidden (/Applications/Google Chrome.app)

Box Edit Application (/Users/[redacted]/Library/Application Support/Box/Box Edit/Box Edit.app)

Box Local Com Server Application (/Users/[redacted]/Library/Application Support/Box/Box Edit/Box Local Com Server.app)

Internet Plug-ins: ℹ️

MeetingJoinPlugin: Version: Unknown - SDK 10.6 [Click for support]

o1dbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]

Default Browser: Version: 537 - SDK 10.9

Flip4Mac WMV Plugin: Version: 3.0.0.126 - SDK 10.8 [Click for support]

OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]

AdobePDFViewerNPAPI: Version: 10.1.13 [Click for support]

FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]

Silverlight: Version: 5.1.10411.0 - SDK 10.6 [Click for support]

Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]

iPhotoPhotocast: Version: 7.0 - SDK 10.8

googletalkbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]

QuickTime Plugin: Version: 7.7.3

AdobePDFViewer: Version: 10.1.13 [Click for support]

SharePointBrowserPlugin: Version: 14.4.7 - SDK 10.6 [Click for support]

JavaAppletPlugin: Version: Java 7 Update 55 Check version

User internet Plug-ins: ℹ️

ATTConnectEventEntry: Version: 1.0.0 - SDK 10.6

NPRoblox: Version: 1, 2, 8, 25 - SDK 10.10 [Click for support]

ZoomUsPlugIn: Version: 3.5.8412.0202 - SDK 10.10 [Click for support]

WebEx64: Version: 1.0 - SDK 10.6 [Click for support]

WebEx: Version: 1.0 [Click for support]

Google Earth Web Plug-in: Version: 7.1 [Click for support]

CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 [Click for support]

Safari Extensions: ℹ️

Ghostery

Evernote Web Clipper

FastestTube

Reddit Enhancement Suite

Amazon Search Menu Item

autocomplete

AdBlock

Audio Plug-ins: ℹ️

EcammAudioLoader: Version: 1.0.3 - SDK 10.8 [Click for support]

CallRecorder: Version: v2.5.12 - SDK 10.8 [Click for support]

3rd Party Preference Panes: ℹ️

Backblaze Backup [Click for support]

Flash Player [Click for support]

Flip4Mac WMV [Click for support]

GPGPreferences [Click for support]

Java [Click for support]

MacFUSE [Click for support]

Perian [Click for support]

Time Machine: ℹ️

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 999.35 GB Disk used: 834.36 GB

Destinations:

Time Machine 2 [Local]

Total size: 4.00 TB

Total number of backups: 88

Oldest backup: 2014-01-23 13:10:19 +0000

Last backup: 2015-05-05 13:52:52 +0000

Size of backup disk: Excellent

Backup size 4.00 TB > (Disk size 999.35 GB X 3)

Top Processes by CPU: ℹ️

22% bzfilelist

3% Google Chrome Helper(5)

1% fontd

0% mds

0% WindowServer

Top Processes by Memory: ℹ️

1.38 GB com.apple.WebKit.WebContent(8)

1.14 GB kernel_task

803 MB Google Chrome Helper(5)

442 MB Mail

311 MB WindowServer

Virtual Memory Information: ℹ️

54 MB Free RAM

16.00 GB Used RAM

512 KB Swap Used

Diagnostics Information: ℹ️

May 4, 2015, 09:57:36 PM Self test - passed

May 4, 2015, 09:28:28 PM /Library/Logs/DiagnosticReports/Google Drive_2015-05-04-212828_[redacted].crash

May 4, 2015, 05:14:31 PM /Users/[redacted]/Library/Logs/DiagnosticReports/Transmission_2015-05-04-171431 _[redacted].crash