My mac air is extremely slow

Question

My MacAir is almost hanged.  I have run an EtreCheck.  below is the report.  Please kindly advise..
Etrecheck report:
Hardware Information:
          MacBook Air (13-inch, Mid 2012)
          MacBook Air - model: MacBookAir5,2
          1 1.8 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 0:17:51
Disk Information:
          APPLE SSD TS128E disk0 : (121.33 GB)
                    disk0s1 (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 120.47 GB (33.15 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Internal Memory Card Reader
          Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Gatekeeper:
          Unknown!
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist Support
          [loaded] com.microsoft.office.licensing.helper.plist Support
          [loaded] com.oracle.java.Helper-Tool.plist Support
Launch Agents:
          [loaded] com.oracle.java.Java-Updater.plist Support
User Launch Agents:
          [loaded] com.adobe.ARM.[...].plist Support
          [loaded] com.google.keystone.agent.plist Support
User Login Items:
          iTunesHelper
          Battery Health
          Google Drive
          Dropbox
Internet Plug-ins:
          Flip4Mac WMV Plugin: Version: 3.0.0.126   - SDK 10.8 Support
          FlashPlayer-10.6: Version: 13.0.0.214 - SDK 10.6 Support
          QuickTime Plugin: Version: 7.7.1
          AdobePDFViewerNPAPI: Version: 11.0.04 - SDK 10.6 Support
          Flash Player: Version: 13.0.0.214 - SDK 10.6 Support
          AdobePDFViewer: Version: 11.0.04 - SDK 10.6 Support
          SharePointBrowserPlugin: Version: 14.3.8 - SDK 10.6 Support
          JavaAppletPlugin: Version: Java 7 Update 25 Check version
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  Support
          Flip4Mac WMV  Support
          Java  Support
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               3%          WindowServer
               1%          fontd
               0%          Battery Health
               0%          Google Drive
               0%          coreservicesd
Top Processes by Memory:
          217 MB          Mail
          168 MB          WebProcess
          82 MB          mds
          61 MB          Dropbox
          49 MB          Safari
Virtual Memory Information:
          1.67 GB          Free RAM
          1.03 GB          Active RAM
          192 MB          Inactive RAM
          1.10 GB          Wired RAM
          689 MB          Page-ins
          0 B          Page-outs

Answer 1

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.