Computer running slowly, EtreCheck report attached, diagnosis please?

Question

Would someone please help me understand what this EtreCheck report is telling me. Wondering how best to add some pep to this machine. Thank so much!
Problem description:
Computer is operating slowly
EtreCheck version: 2.1.5 (108)
Report generated January 13, 2015 at 10:01:43 PM CST
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
  iMac (21.5-inch, Mid 2010) (Verified)
  iMac - model: iMac11,2
  1 3.06 GHz Intel Core i3 CPU: 2-core
  4 GB RAM Upgradeable
  BANK 0/DIMM0
  empty empty empty empty
  BANK 1/DIMM0
  empty empty empty empty
  BANK 0/DIMM1
  2 GB DDR3 1333 MHz ok
  BANK 1/DIMM1
  2 GB DDR3 1333 MHz ok
  Bluetooth: Old - Handoff/Airdrop2 not supported
  Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
  ATI Radeon HD 4670 - VRAM: 256 MB
  iMac 1920 x 1080
System Software: ℹ️
  OS X 10.10.1 (14B25) - Uptime: 5 days 18:35:1
Disk Information: ℹ️
  WDC WD5000AAKS-40V6A0 disk0 : (500.11 GB)
  EFI (disk0s1) <not mounted> : 210 MB
  Macintosh HD (disk0s2) / : 499.25 GB (65.12 GB free)
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
  HL-DT-STDVDRW  GA32N 
USB Information: ℹ️
  Apple Computer, Inc. IR Receiver
  Apple Inc. Built-in iSight
  Apple Internal Memory Card Reader
  Apple Inc. BRCM2046 Hub
  Apple Inc. Bluetooth USB Host Controller
Firewire Information: ℹ️
  Iomega HDD unknown_device 800mbit - 800mbit max
  disk1s1 (disk1s1) <not mounted> : 32 KB
  Iomega HDD (disk1s3) /Volumes/Iomega HDD : 1.00 TB (227.87 GB free)
Gatekeeper: ℹ️
  Mac App Store and identified developers
Kernel Extensions: ℹ️
  /Library/Extensions
  [not loaded] com.leapfrog.driver.LfConnectDriver (1.11.1 - SDK 10.10) [Support]
  /System/Library/Extensions
  [not loaded] com.leapfrog.codeless.kext (2) [Support]
  [not loaded] com.pctools.iantivirus.kfs (1.0.1) [Support]
Launch Agents: ℹ️
  [loaded] com.citrix.AuthManager_Mac.plist [Support]
  [running] com.citrix.ServiceRecords.plist [Support]
  [loaded] com.hp.help.tocgenerator.plist [Support]
Launch Daemons: ℹ️
  [loaded] com.adobe.fpsaud.plist [Support]
  [loaded] com.leapfrog.connect.authdaemon.plist [Support]
User Launch Agents: ℹ️
  [running] com.leapfrog.connect.monitor.plist [Support]
User Login Items: ℹ️
  iTunesHelper UNKNOWNHidden (missing value)
  Dropbox Application (/Applications/Dropbox.app)
  iAntiVirus ApplicationHidden (/Applications/iAntiVirus/iAntiVirus.app)
  HP Product Research Application (/Library/Application Support/Hewlett-Packard/Customer Participation/HP Product Research.app)
Internet Plug-ins: ℹ️
  Photo Center Plugin: Version: Photo Center Plugin 1.1.2.2 [Support]
  FlashPlayer-10.6: Version: 16.0.0.257 - SDK 10.6 [Support]
  Default Browser: Version: 600 - SDK 10.10
  Flash Player: Version: 16.0.0.257 - SDK 10.6 [Support]
  QuickTime Plugin: Version: 7.7.3
  CitrixICAClientPlugIn: Version: 1.0 - SDK 10.6 [Support]
  OfficeLiveBrowserPlugin: Version: 12.3.4 [Support]
  CouponPrinter-FireFox: Version: Version 1.1.5
  Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Support]
  iPhotoPhotocast: Version: 7.0
3rd Party Preference Panes: ℹ️
  Citrix ShareFile Sync  [Support]
  Flash Player  [Support]
Time Machine: ℹ️
  Auto backup: YES
  Volumes being backed up:
  Macintosh HD: Disk size: 499.25 GB Disk used: 434.13 GB
  Destinations:
  Iomega HDD [Local]
  Total size: 1.00 TB
  Total number of backups: 219
  Oldest backup: 2010-09-04 20:04:18 +0000
  Last backup: 2015-01-14 03:32:11 +0000
  Size of backup disk: Too small
  Backup size 1.00 TB < (Disk used 434.13 GB X 3)
Top Processes by CPU: ℹ️
      2% WindowServer
      0% fontd
      0% AppleSpell
      0% notifyd
      0% askpermissiond
Top Processes by Memory: ℹ️
  382 MB com.apple.WebKit.WebContent
  168 MB softwareupdated
  99 MB Finder
  90 MB Safari
  86 MB mds_stores
Virtual Memory Information: ℹ️
  275 MB Free RAM
  1.64 GB Active RAM
  1.39 GB Inactive RAM
  677 MB Wired RAM
  22.83 GB Page-ins
  1.19 GB Page-outs

Answer 1

Add more RAM and reinstall Yosemite.
Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
OS X Yosemite- Reinstall OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.