I performed a scan of the mac and got this info about the hardware and software
Problem description:
slow mac
EtreCheck version: 2.0.8 (95)
Report generated October 31, 2014 at 7:52:00 PM GMT+3
Hardware Information: ℹ️
MacBook Pro (13-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,1
1 2.3 GHz Intel Core i5 CPU: 2-core
8 GB RAM Upgradeable
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 512 MB
Color LCD 1280 x 800
System Software: ℹ️
OS X 10.9.5 (13F34) - Uptime: 0:22:26
Disk Information: ℹ️
WDC WD10S12X-55JTET0 disk0 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 999.35 GB (577.02 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
MATSHITADVD-R UJ-8A8
USB Information: ℹ️
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. FaceTime HD Camera (Built-in)
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Anywhere
Kernel Extensions: ℹ️
/Library/Application Support/Avast/components/fileshield/unsigned
[loaded] com.avast.AvastFileShield (2.1.0 - SDK 10.9) Support
/Library/Application Support/Avast/components/proxy/unsigned
[loaded] com.avast.PacketForwarder (1.4 - SDK 10.9) Support
/Library/Application Support/Hotspot Shield
[not loaded] com.anchorfree.tun (1.1.1 - SDK 10.8) Support
/System/Library/Extensions
[loaded] com.netralia.driver.VBMicDriver (1.0.0 - SDK 10.7) Support
[loaded] com.netralia.driver.VBSpeakerDriver (1.0.0 - SDK 10.7) Support
[not loaded] com.paceap.kext.pacesupport.master (5.9 - SDK 10.6) Support
[not loaded] com.wacom.kext.pentablet (5.3.3 - SDK 10.8) Support
/System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
[not loaded] com.paceap.kext.pacesupport.leopard (5.9 - SDK 10.4) Support
[not loaded] com.paceap.kext.pacesupport.panther (5.9 - SDK 10.-1) Support
[loaded] com.paceap.kext.pacesupport.snowleopard (5.9 - SDK 10.6) Support
[not loaded] com.paceap.kext.pacesupport.tiger (5.9 - SDK 10.4) Support
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.avast.userinit.plist Support
[loaded] com.divx.dms.agent.plist Support
[loaded] com.divx.update.agent.plist Support
[loaded] com.google.keystone.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
[running] com.wacom.pentablet.plist Support
[loaded] org.macosforge.xquartz.startx.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[invalid?] com.adobe.SwitchBoard.plist Support
[loaded] com.anchorfree.ajaxserver.plist Support
[loaded] com.avast.init.plist Support
[loaded] com.avast.uninstall.plist Support
[loaded] com.avast.update.plist Support
[loaded] com.barebones.authd.plist Support
[not loaded] com.barebones.textwrangler.plist Support
[running] com.cleverfiles.cfbackd.plist Support
[invalid?] com.eset.esets_daemon.plist Support
[not loaded] com.fernlightning.fseventer.plist Support
[loaded] com.google.keystone.daemon.plist Support
[running] com.magican.castle.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
[loaded] com.oracle.java.JavaUpdateHelper.plist Support
[invalid?] com.prosoftnet.idrivedaemon.plist Support
[invalid?] com.prosoftnet.idwebdaemon.plist Support
[loaded] com.sharpcast.xfsmond.plist Support
[loaded] org.macosforge.xquartz.privileged_startx.plist Support
[loaded] PACESupport.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.adobe.ARM.[...].plist Support
[loaded] com.adobe.ARM.[...].plist Support
[invalid?] com.avast.home.userinit.plist Support
[invalid?] org.virtualbox.vboxwebsrv.plist Support
[invalid?] uk.co.markallan.clamxav.freshclam.plist Support
User Login Items: ℹ️
AdobeResourceSynchronizer ApplicationHidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
Internet Plug-ins: ℹ️
JavaAppletPlugin: Version: Java 8 Update 25 Check version
WacomNetscape: Version: 2.1.0-1 - SDK 10.8 Support
OVSHelper: Version: 1.1 Support
Default Browser: Version: 537 - SDK 10.9
AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 Support
WacomTabletPlugin: Version: WacomTabletPlugin 2.1.0.2 Support
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
DivX Web Player: Version: 3.2.3.1164 - SDK 10.6 Support
Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Mismatch! Adobe recommends 15.0.0.189
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.2.0 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
DirectorShockwave: Version: 11.6.8r638 Support
User Internet Plug-ins: ℹ️
Folx3Plugin: Version: 3.0.1 - SDK 10.6 Support
Safari Extensions: ℹ️
AdBlock
iTube Studio
Avast Online Security
OpenIE
3rd Party Preference Panes: ℹ️
Fan Control Support
Flash Player Support
FUSE for OS X (OSXFUSE) Support
Java Support
Perian Support
Tuxera NTFS Support
PenTablet Support
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
34% firefox
8% WindowServer
4% Transmission
2% mds
1% com.avast.daemon
Top Processes by Memory: ℹ️
481 MB firefox
198 MB com.apple.IconServicesAgent
137 MB com.avast.daemon
129 MB Transmission
112 MB mds_stores
Virtual Memory Information: ℹ️
2.65 GB Free RAM
2.71 GB Active RAM
1.76 GB Inactive RAM
1.47 GB Wired RAM
1.67 GB Page-ins
0 B Page-outs