Slow iMac from early 2009

I am wondering if there is anything I can do to help my early 2009 iMac: it seems to be really slow lately, especially when I use iPhoto '09 v8.1.2. Even loading things on Safari v7.1 seems to take longer than it used to. I have Mavericks OSX v10.9.5, I'm not sure it that is part of the problem or not. And now Yosemite OSX is out and I'm reluctant to install it while I'm having these issues already. Any advice?

Thank you!

I saw on a different post that using etrecheck could be helpful, so here it is:

Problem description:

My iMac seems slow, especially when using iPhoto and Safari.

EtreCheck version: 2.1.6 (109)

Report generated January 22, 2015 at 12:06:06 PM PST

Download EtreCheck from http://etresoft.com/etrecheck

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Click the [Details] links for more information about that line.

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Hardware Information: ℹ️

iMac (20-inch, Early 2009) (Verified)

iMac - model: iMac9,1

1 2.66 GHz Intel Core 2 Duo CPU: 2-core

2 GB RAM Upgradeable

BANK 0/DIMM0

1 GB DDR3 1067 MHz ok

BANK 1/DIMM0

1 GB DDR3 1067 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Video Information: ℹ️

NVIDIA GeForce 9400 - VRAM: 256 MB

iMac 1680 x 1050

System Software: ℹ️

OS X 10.9.5 (13F34) - Time since boot: 20:2:46

Disk Information: ℹ️

Hitachi HDT721032SLA380 disk0 : (320.07 GB)

EFI (disk0s1) <not mounted> : 210 MB

Macintosh HD (disk0s2) / : 319.21 GB (199.98 GB free)

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

OPTIARC DVD RW AD-5670S

USB Information: ℹ️

Apple Inc. Built-in iSight

LaCie P'9233 Desktop Drive 2 TB

EFI (disk1s1) <not mounted> : 210 MB

LaCie (disk1s2) /Volumes/LaCie : 2.00 TB (1.37 TB free)

Apple Inc. Keyboard Hub

Mitsumi Electric Apple Optical USB Mouse

Apple Inc. Apple Keyboard

EPSON EPSON Scanner

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller

Gatekeeper: ℹ️

Mac App Store and identified developers

Kernel Extensions: ℹ️

/Applications/LaCie Desktop Manager.app

[not loaded] com.LaCie.ScsiType00 (1.2.13 - SDK 10.5) [Support]

[not loaded] com.jmicron.driver.jmPeripheralDevice (2.0.4) [Support]

[not loaded] com.lacie.driver.LaCie_RemoteComms (1.0.1 - SDK 10.5) [Support]

[not loaded] com.oxsemi.driver.OxsemiDeviceType00 (1.28.13 - SDK 10.5) [Support]

/System/Library/Extensions

[not loaded] com.flipvideo.IOUSBCameraMassStorage (1.0.0) [Support]

Launch Agents: ℹ️

[running] com.flipvideo.FlipShare.AutoRun.plist [Support]

[loaded] com.google.keystone.agent.plist [Support]

[loaded] com.intego.backupassistant.agent.plist [Support]

Launch Daemons: ℹ️

[loaded] com.adobe.fpsaud.plist [Support]

[loaded] com.google.keystone.daemon.plist [Support]

[running] com.intego.BackupAssistant.daemon.plist [Support]

User Launch Agents: ℹ️

[loaded] com.adobe.ARM.[...].plist [Support]

[loaded] com.adobe.ARM.[...].plist [Support]

User Login Items: ℹ️

Skype Application (/Applications/Skype.app)

iTunesHelper Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

AdobeResourceSynchronizer Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)

Internet Plug-ins: ℹ️

o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]

Google Earth Web Plug-in: Version: 6.1 [Support]

Default Browser: Version: 537 - SDK 10.9

Flip4Mac WMV Plugin: Version: 2.2.3.7 [Support]

AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Support]

FlashPlayer-10.6: Version: 16.0.0.287 - SDK 10.6 [Support]

Silverlight: Version: 4.0.60129.0 [Support]

Flash Player: Version: 16.0.0.287 - SDK 10.6 [Support]

QuickTime Plugin: Version: 7.7.3

googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 [Support]

iPhotoPhotocast: Version: 7.0

AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Support]

JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version

User internet Plug-ins: ℹ️

Move_Media_Player: Version: npmnqmp 071701000001 [Support]

WebEx64: Version: 1.0 - SDK 10.5 [Support]

3rd Party Preference Panes: ℹ️

Flash Player [Support]

Flip4Mac WMV [Support]

FUSE for OS X (OSXFUSE) [Support]

Perian [Support]

Time Machine: ℹ️

Time Machine not configured!

Top Processes by CPU: ℹ️

15% mdworker

4% WindowServer

1% fontd

0% EPSON Scanner

0% ocspd

Top Processes by Memory: ℹ️

32 MB WindowServer

28 MB mds_stores

26 MB installd

24 MB mds

19 MB Finder

Virtual Memory Information: ℹ️

556 MB Free RAM

396 MB Active RAM

385 MB Inactive RAM

377 MB Wired RAM

645 MB Page-ins

4 MB Page-outs

Diagnostics Information: ℹ️

Jan 21, 2015, 04:04:02 PM Self test - passed