I ran EtreCheck and this is the summary:
EtreCheck version: 2.6.6 (226)
Report generated 12/14/15, 11:25 AM
Runtime 1:33
Download EtreCheck from http://etrecheck.com
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: (What does this mean?)
MacBook Pro (Retina, 15-inch, Early 2013)
[Click for Technical Specifications]
[Click for User Guide]
MacBook Pro - model: MacBookPro10,1
1 2.7 GHz Intel Core i7 CPU: 4-core
16 GB RAM Not upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 41 - SN = D863114Q39MF9Y2A9
Video Information: (What does this mean?)
Intel HD Graphics 4000
NVIDIA GeForce GT 650M - VRAM: 1024 MB
Color LCD 2880 x 1800
System Software: (What does this mean?)
OS X El Capitan 10.11.1 (15B42) - Time since boot: about one day
Disk Information: (What does this mean?)
APPLE SSD SD512E disk0 : (500.28 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 499.05 GB (302.27 GB free)
Core Storage: disk0s2 499.42 GB Online
USB Information: (What does this mean?)
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Fitbit Inc. Fitbit Base Station
Thunderbolt Information: (What does this mean?)
Apple Inc. thunderbolt_bus
Gatekeeper: (What does this mean?)
Mac App Store and identified developers
System Launch Agents: (What does this mean?)
[killed] com.apple.AssetCacheLocatorService.plist
[killed] com.apple.CallHistoryPluginHelper.plist
[killed] com.apple.CallHistorySyncHelper.plist
[killed] com.apple.SafariCloudHistoryPushAgent.plist
[killed] com.apple.printtool.agent.plist
[killed] com.apple.scopedbookmarkagent.xpc.plist
6 processes killed due to insufficient RAM
System Launch Daemons: (What does this mean?)
[killed] com.apple.AssetCacheLocatorService.plist
[killed] com.apple.icloud.findmydeviced.plist
[killed] com.apple.nsurlsessiond.plist
[killed] com.apple.periodic-monthly.plist
[killed] com.apple.sandboxd.plist
[killed] com.apple.wdhelper.plist
6 processes killed due to insufficient RAM
Launch Agents: (What does this mean?)
[loaded] com.oracle.java.Java-Updater.plist [Click for support]
Launch Daemons: (What does this mean?)
[loaded] com.adobe.SC.FPFeedbackService-1.0.plist [Click for support]
[loaded] com.adobe.fpsaud.plist [Click for support]
[running] com.fitbit.galileod.plist [Click for support]
[loaded] com.microsoft.office.licensing.helper.plist [Click for support]
[loaded] com.oracle.java.Helper-Tool.plist [Click for support]
[running] com.sonos.SonosLibraryServer.plist [Click for support]
User Launch Agents: (What does this mean?)
[loaded] com.google.keystone.agent.plist [Click for support]
User Login Items: (What does this mean?)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Fitbit Connect Menubar Helper Application (/Applications/Fitbit Connect.app/Contents/MacOS/Fitbit Connect Menubar Helper.app)
Eyefi Mobi Application (/Applications/Eyefi Mobi.app)
Google Chrome Application Hidden (/Applications/Google Chrome.app)
Other Apps: (What does this mean?)
[running] com.apple.xpc.launchd.oneshot.0x10000008.EtreCheck
[running] com.evernote.EvernoteHelper
[running] com.fitbit.GalileoMenubar.72992
[running] com.getdropbox.dropbox.47392
[running] fi.eye.mobi.48032
Internet Plug-ins: (What does this mean?)
SharePointBrowserPlugin: Version: 14.5.8 - SDK 10.6 [Click for support]
FlashPlayer-10.6: Version: 20.0.0.235 - SDK 10.6 [Click for support]
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 20.0.0.235 - SDK 10.6 [Click for support]
JavaAppletPlugin: Version: Java 8 Update 66 build 17 Check version
Default Browser: Version: 601 - SDK 10.11
User internet Plug-ins: (What does this mean?)
Google Earth Web Plug-in: Version: 7.1 [Click for support]
Safari Extensions: (What does this mean?)
Evernote Web Clipper
3rd Party Preference Panes: (What does this mean?)
Flash Player [Click for support]
Java [Click for support]
Time Machine: (What does this mean?)
Time Machine not configured!
Top Processes by CPU: (What does this mean?)
6% com.apple.WebKit.WebContent(8)
5% WindowServer
2% coreaudiod
2% fontd
1% kernel_task
Top Processes by Memory: (What does this mean?)
7.02 GB com.apple.WebKit.WebContent(8)
1.47 GB kernel_task
1.15 GB com.apple.WebKit.Plugin.64
344 MB Safari
262 MB WindowServer
Virtual Memory Information: (What does this mean?)
558 MB Free RAM
15.00 GB Used RAM (1.77 GB Cached)
110 MB Swap Used
Diagnostics Information: (What does this mean?)
Dec 13, 2015, 07:38:41 AM Self test - passed