Please post an EtreCheck report of your system and we can look for obvious issues. You can get EtreCheck by clicking:
http://www.etresoft.com/etrecheck
Just downloaded and used EtreCheck, here are my results: (note: some text is in red on the actual report but it's not showing that on the forum).
Problem description:
slow boot up and app loading
EtreCheck version: 2.3 (135)
Report generated 8/8/15, 3:03 PM
Download EtreCheck from http://etresoft.com/etrecheck
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Hardware Information: (What does this mean?)
iMac (21.5-inch, Late 2013)
(Technical Specifications)
iMac - model: iMac14,3
1 2.9 GHz Intel Core i5 CPU: 4-core
8 GB RAM
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n/ac
Video Information: (What does this mean?)
NVIDIA GeForce GT 750M - VRAM: 1024 MB
iMac 1920 x 1080
DELL SE198WFP 1440 x 900 @ 60 Hz
System Software: (What does this mean?)
OS X 10.9.2 (13C64) - Time since boot: less than an hour
Disk Information: (What does this mean?)
APPLE HDD HTS541010A9E662 disk0 : (1 TB) (Rotational)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.86 GB (824.12 GB free)
USB Information: (What does this mean?)
JMicron Samsung M3 Portable 1 TB
Primary xHD (everything) (disk1s1) /Volumes/Primary xHD (everything) : 1.00 TB (7.37 GB free)
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Apple, Inc. Keyboard Hub
Mitsumi Electric Apple Optical USB Mouse
Apple, Inc Apple Keyboard
Burr-Brown from TI USB Audio CODEC
Action Star USB2.0 Hub
Action Star USB2.0 Hub
Action Star USB HID
Action Star USB HID
ION Key49
Thunderbolt Information: (What does this mean?)
Apple Inc. thunderbolt_bus
Configuration files: (What does this mean?)
/etc/hosts - Count: 20
Gatekeeper: (What does this mean?)
Anywhere
Kernel Extensions: (What does this mean?)
/Applications/Toast 11 Titanium/Spin Doctor.app
[not loaded] com.hzsystems.terminus.driver (4)
[Click for support]
/Library/Extensions
[not loaded] com.caiaq.driver.NIUSBMaschineControllerDriver (2.7.0 - SDK 10.9)
[Click for support]
[not loaded] com.m-audio.usb.midisupport.driver (1.4.1 - SDK 10.7)
[Click for support]
[not loaded] jp.co.roland.RDUSB017BDev (1.0.0 - SDK 10.9)
[Click for support]
/System/Library/Extensions
[not loaded] com.wibu.codemeter.CmUSBMassStorage (1.0.7)
[Click for support]
~/Library/Services/ToastIt.service/Contents/MacOS
[not loaded] com.roxio.TDIXController (2.0)
[Click for support]
Startup Items: (What does this mean?)
M-Audio Firmware Loader: Path: /Library/StartupItems/M-Audio Firmware Loader
RDUSB017BStartup: Path: /Library/StartupItems/RDUSB017BStartup
Startup items are obsolete in OS X Yosemite
Launch Agents: (What does this mean?)
[not loaded] com.adobe.AAM.Updater-1.0.plist
[Click for support]
[loaded] com.Arturia.ArturiaSoftwareCenterAgent.plist
[Click for support]
Launch Daemons: (What does this mean?)
[loaded] com.adobe.fpsaud.plist
[Click for support]
[loaded] com.bombich.ccc.plist
[Click for support]
[loaded] com.ea.origin.ESHelper.plist
[Click for support]
[running] com.m-audio.usb.firmwareloader.plist
[Click for support]
[loaded] com.microsoft.office.licensing.helper.plist
[Click for support]
User Launch Agents: (What does this mean?)
[loaded] com.adobe.AAM.Updater-1.0.plist
[Click for support]
[loaded] com.bittorrent.uTorrent.plist
[Click for support]
[loaded] com.digitalrebellion.SoftwareUpdateAutoCheck.plist
[Click for support]
[loaded] com.google.keystone.agent.plist
[Click for support]
[loaded] com.Installer.completer.download.plist
[Click for support]
[loaded] com.Installer.completer.ltvbit.plist
[Click for support]
[failed] com.Installer.completer.update.plist
[Click for support]
[loaded] Manroling.update.plist
[Click for support]
[loaded] Myppes.download.plist
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[loaded] Myppes.ltvbit.plist
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[loaded] Myppes.update.plist
[Click for support]
[loaded] Oliverto.download.plist
[Click for support]
[loaded] Oliverto.ltvbit.plist
[Click for support]
[loaded] Oliverto.update.plist
[Click for support]
User Login Items: (What does this mean?)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Autodesk 360 UNKNOWN (missing value)
NIHardwareAgent Application Hidden (/Library/Application Support/Native Instruments/Hardware/NIHardwareAgent.app)
Internet Plug-ins: (What does this mean?)
AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6
[Click for support]
FlashPlayer-10.6: Version: 18.0.0.194 - SDK 10.6
[Click for support]
Default Browser: Version: 537 - SDK 10.9
AdobePDFViewerNPAPI: Version: 11.0.0 - SDK 10.6
[Click for support]
AdobePDFViewer: Version: 11.0.0 - SDK 10.6
[Click for support]
Flash Player: Version: 18.0.0.194 - SDK 10.6 Outdated!
Update
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.0.0
[Click for support]
iPhotoPhotocast: Version: 7.0 - SDK 10.8
Safari Extensions: (What does this mean?)
AdBlock
GoldenBoy
Audio Plug-ins: (What does this mean?)
DVCPROHDAudio: Version: 1.3.2
3rd Party Preference Panes: (What does this mean?)
Flash Player
[Click for support]
Native Instruments USB Audio
[Click for support]
TB-3
[Click for support]
Time Machine: (What does this mean?)
Time Machine not configured!
Top Processes by CPU: (What does this mean?)
7% iTunes
3% WindowServer
2% coreaudiod
2% fontd
0% RDUSB017BSetupd
Top Processes by Memory: (What does this mean?)
1.20 GB Google Chrome Helper(6)
703 MB kernel_task
524 MB iTunes
319 MB mds_stores
238 MB Google Chrome
Virtual Memory Information: (What does this mean?)
3.70 GB Free RAM
4.30 GB Used RAM (1.84 GB Cached)
0 B Swap Used
Diagnostics Information: (What does this mean?)
Aug 8, 2015, 02:36:12 PM Self test - passed
Aug 6, 2015, 10:12:56 PM /Library/Logs/DiagnosticReports/Kernel_2015-08-06-221256_[redacted].panic
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