Finder has recently slowed dramatically

Greetings all, I'm a somewhat new Mac user (since September of last year). In the last few days I have noticed a pretty big slowdown in my computer's performance. When I started looking for guidance I found out about EtreCheck, so I've installed that to capture the information attached below. I honestly don't see what could be the cause, but as I said I am new-ish to Macs.
My main use is for Photoshop, and the only plugin I have installed for PS is Perfect Studio 9 (just a few days ago, since the slowness).
The question I have is could it be that the HDD is too full? I've recently moved a lot of digital photos onto the drive because my external drive is NTFS formatted, so I can only read files from it, and I want to be able to edit some of these photos. I do intend to get a new external drive for the Mac... I just don't have one yet.
Thanks in advance for any insights/guidance.
RP
Problem description:
Finder is VERY slow responding while previewing RAW images. This is a new “development” in the last 7 to 10 days.
EtreCheck version: 2.1.8 (121)
Report generated February 25, 2015 at 20:57:55 GMT-5
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 2013) (Technical Specifications)
    iMac - model: iMac14,2
    1 3.2 GHz Intel Core i5 CPU: 4-core
    24 GB RAM Upgradeable
        BANK 0/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 0/DIMM1
            8 GB DDR3 1600 MHz ok
        BANK 1/DIMM1
            8 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en1: 802.11 a/b/g/n/ac
Video Information: ℹ️
    NVIDIA GeForce GT 755M - VRAM: 1024 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.9.5 (13F34) - Time since boot: 8:57:52
Disk Information: ℹ️
    APPLE HDD ST1000DM003 disk0 : (1 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 999.35 GB (295.66 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. FaceTime HD Camera (Built-in)
    Logitech USB-PS/2 Optical Mouse
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Library/Application Support/Avast/components/fileshield/unsigned
    [loaded]    com.avast.AvastFileShield (2.1.0 - SDK 10.9) [Click for support]
        /Library/Application Support/Avast/components/proxy/unsigned
    [loaded]    com.avast.PacketForwarder (2.0 - SDK 10.9) [Click for support]
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.adobe.AdobeCreativeCloud.plist [Click for support]
    [running]    com.avast.update-agent.plist [Click for support]
    [loaded]    com.avast.userinit.plist [Click for support]
    [running]    com.epson.eventmanager.agent.plist [Click for support]
Launch Daemons: ℹ️
    [running]    com.adobe.adobeupdatedaemon.plist [Click for support]
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.avast.init.plist [Click for support]
    [loaded]    com.avast.uninstall.plist [Click for support]
    [loaded]    com.avast.update.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [loaded]    fi.polar.libpolar.plist [Click for support]
    [running]    fi.polar.polard.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.avast.home.userinit.plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Launch Nikon Message Center 2    Application  (/Applications/Nikon Software/Nikon Message Center 2/Nikon Message Center 2.app/Contents/SharedSupport/Launch Nikon Message Center 2.app)
    WebSync    Application  (/Applications/WebSync.app)
    Android File Transfer Agent    Application  (/Users/[redacted]/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Default Browser: Version: 537 - SDK 10.9
    SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
Safari Extensions: ℹ️
    Avast Online Security
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        11%    mds
         7%    firefox
         4%    WindowServer
         1%    fontd
         0%    com.avast.fileshield
Top Processes by Memory: ℹ️
    309 MB    firefox
    180 MB    WindowServer
    155 MB    com.avast.daemon
    129 MB    Finder
    129 MB    mds_stores
Virtual Memory Information: ℹ️
    8.26 GB    Free RAM
    3.67 GB    Active RAM
    12.21 GB    Inactive RAM
    1.63 GB    Wired RAM
    26.40 GB    Page-ins
    11 MB    Page-outs
Diagnostics Information: ℹ️
    Feb 25, 2015, 03:17:58 PM    /Library/Logs/DiagnosticReports/Finder_2015-02-25-151758_[redacted].hang
    Feb 25, 2015, 11:59:10 AM    Self test - passed
    Feb 23, 2015, 09:50:59 PM    /Library/Logs/DiagnosticReports/firefox_2015-02-23-215059_[redacted].hang
    Feb 23, 2015, 01:46:38 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Font Book_2015-02-23-134638_[redacted].crash
    Feb 23, 2015, 01:44:42 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Font Book_2015-02-23-134442_[redacted].crash
    Feb 23, 2015, 01:41:36 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Font Book_2015-02-23-134136_[redacted].crash
    Feb 23, 2015, 01:34:14 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Font Book_2015-02-23-133414_[redacted].crash

    24 GB RAM Upgradeable
    OS X 10.9.5 (13F34) - Time since boot: 8:57:52
    26.40 GB    Page-ins
    11 MB    Page-outs
You have 24GB of RAM (a nice amount), but for a system that has been up 9 hours, you have 26GB of page-ins.  Luckily only 11MB of page-outs (trivial).
Understanding page-in stats is mostly "Voodoo", in that there are perfectly good reasons to have page-in, but generally page-in values are alot lower than 26GB in only 9 hours.  For example, my Macbook Pro has been up for 19 days, and only has 9+GB of page-in activity.
One cause of page-in activity is utilities that purge RAM to get free pages, forcing read-only code of running programs out of RAM, such that when the program needs that code again, it has to page-in the code.  Since the code is read-only, the operating system does not need to page-out the code, it just throws away the code, and will page-in from the executable program file when it needs it again.  An aggressive utility that attempts to keep lots of free RAM will force a program to keep paging-in its code over and over again.
You might get the same behavior if Photoshop usage is processing some huge images such that the images being edited are consuming far more than your 24GB.  This is always possible, since you went to the trouble to buy 24GB of RAM and image processing can be very RAM intensive.  If you are trying to run other programs while Photoshop is processing the huge images, this might be what is forcing the operating system to throw read-only code out of RAM and then paging-it the code again, and again, etc...
Finally, I do not know how Photoshop read images into RAM nor how Photoshop manages it scratch files.  It could be using memory mapped files, which would then be read into RAM by paging-in the file contents.  HOWEVER, any modifications to a memory mapped file would result in page-out activity, and since you ONLY have 11MB, I find it hard to believe Photoshop is using memory mapped files, unless you "Look but Don't Touch" when using Photoshop.
Like I sais page-in activity analysis is "Voodoo" and not easy to quantify.
if you know you are running a utility to create free RAM, than that is most likely the cause.  If you are running other programs while Photoshopping huge images, that might be the cause.
Now matter what the cause, 26GB of disk reading in 9 hours is an average of 50MB a minute non-stop.  That is going to slow down any actions that involve accessing the disk.

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    Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Test while in safe mode. Same problem?
    After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

  • Finder is really SLOW!!!!!!!

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    Does anyone have a fix, update or any advice on how to fix this?
    I apologize for the long post but i searched a bit and many symptoms seem to be different.
    thanks in advance.

    HI Ethan,
    Check for available disk space.
    Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. *Make sure you always have a minimum of 10% to 15% free disk space at all times.*
    Stopping Spotlight Indexing
    Spotlight Tips
    Carolyn

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