IMac "Color Wheels" Despite Tons of Free CPU & Memory

Hello ASC,
That wretched spinning color wheel has been plaguing my iMac lately. I’ve keep an eye on the Activity Monitor and even when the wheel freezes up my Safari, Spotlight Search, Mail and Messages apps, my *free* CPU hardly dips below 97% and my available RAM is over 10GB (out of 16GB). A rudimentary knowledge of computers tells me that I shouldn’t be experiencing these lags in performance with numbers like these. (Note: I haven’t tested this much but it does seem that these lags are only happening with Apple apps; for example, it doesn’t happen with Spotify.)
I’ve ran an EtreCheck, which you can see below. It says my disk has "41 errors", though it doesn't get specific. I've "verified" my disk with the Disk Utility and couldn't find any errors. Any advice would be greatly appreciated!
EtreCheck version: 2.1.8 (121)
Report generated March 30, 2015 at 11:55:41 AM MDT
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
    iMac (27-inch, Late 2012) (Technical Specifications)
    iMac - model: iMac13,2
    1 3.4 GHz Intel Core i7 CPU: 4-core
    16 GB RAM Upgradeable
        BANK 0/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 0/DIMM1
            Empty  
        BANK 1/DIMM1
            Empty  
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
    NVIDIA GeForce GTX 680MX - VRAM: 2048 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 0:39:19
Disk Information: ℹ️
    APPLE HDD ST3000DM001 disk1 : (3 TB)
        EFI (disk1s1) <not mounted> : 210 MB
        Boot OS X (disk1s3) <not mounted> : 134 MB
        Boot OS X (disk1s5) <not mounted> : 134 MB
        Macintosh HD (disk2) / : 3.11 TB (3.00 TB free) - 41 errors
            Core Storage: disk1s2 2.20 TB Online
            Core Storage: disk1s4 801.44 GB Online
            Core Storage: disk0s2 120.99 GB Online
        Macintosh HD (disk2) / : 3.11 TB (3.00 TB free) - 41 errors
            Core Storage: disk1s2 2.20 TB Online
            Core Storage: disk1s4 801.44 GB Online
            Core Storage: disk0s2 120.99 GB Online
    APPLE SSD SM128E disk0 : (121.33 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Boot OS X (disk0s3) <not mounted> : 134 MB
        Macintosh HD (disk2) / : 3.11 TB (3.00 TB free) - 41 errors
            Core Storage: disk1s2 2.20 TB Online
            Core Storage: disk1s4 801.44 GB Online
            Core Storage: disk0s2 120.99 GB Online
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. iPad
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.bittorrent.uTorrent.plist [Click for support]
    [running]    com.spotify.webhelper.plist [Click for support]
User Login Items: ℹ️
    Mail    Application  (/Applications/Mail.app)
    uTorrent    Application  (/Applications/uTorrent.app)
    BetterSnapTool    Application  (/Applications/BetterSnapTool.app)
    Spotify    Application Hidden (/Applications/Spotify.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Default Browser: Version: 600 - SDK 10.10
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         3%    WindowServer
         2%    Spotify
         1%    com.apple.WebKit.Networking
         1%    com.apple.WebKit.Plugin.64
         1%    Spotify Helper
Top Processes by Memory: ℹ️
    309 MB    mds_stores
    275 MB    Safari
    155 MB    com.apple.WebKit.Plugin.64
    137 MB    ocspd
    86 MB    com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
    10.56 GB    Free RAM
    4.65 GB    Active RAM
    757 MB    Inactive RAM
    1.21 GB    Wired RAM
    1.34 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Mar 30, 2015, 11:16:19 AM    Self test - passed

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.  
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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 and start typing the name.
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.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
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