Safari is very slow

Last weeks Safari on my iMac is running very slow. The problems is not in the internet speed since that is almost running at maximum speed. I've run an EtreCheck this morning. Maybe someone can help me with the results.
Problem description:
Safari very slow
EtreCheck version: 2.1.8 (121)
Report generated 17 april 2015 09:24:50 CEST
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 (21.5-inch, Mid 2010) (Technical Specifications)
    iMac - model: iMac11,2
    1 3.06 GHz Intel Core i3 CPU: 2-core
    12 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 0/DIMM1
            4 GB DDR3 1333 MHz ok
        BANK 1/DIMM1
            4 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 4670 - VRAM: 256 MB
        iMac 1920 x 1080
System Software: ℹ️
    OS X 10.10.3 (14D131) - Time since boot: 0:53:38
Disk Information: ℹ️
    WDC WD5000AAKS-40V6A0 disk0 : (500,11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 499.25 GB (171.59 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    OPTIARC DVD RW AD-5680H
USB Information: ℹ️
    Apple, Inc. Keyboard Hub
        Apple Inc. Apple Keyboard
    Apple Inc. Built-in iSight
    Apple Computer, Inc. IR Receiver
    TOSHIBA USB 3.5"-HDD 640,14 GB
        USB-HDD (disk1s1) /Volumes/USB-HDD : 640.13 GB (222.60 GB free)
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Internal Memory Card Reader
Gatekeeper: ℹ️
    Mac App Store and identified developers
Problem System Launch Agents: ℹ️
    [unknown]    .naslist (hidden) [Click for support]
Launch Agents: ℹ️
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [loaded]    jp.buffalo.NASPower.plist [Click for support]
    [not loaded]    jp.buffalo.NASPower_pla.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.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.oracle.java.JavaUpdateHelper.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Programma (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
    JavaAppletPlugin: Version: Java 8 Update 45 Check version
    FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    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: 17.0.0.169 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    GarminGpsControl: Version: 4.2.0.0 - SDK 10.8 [Click for support]
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
    iPhotoPhotocast: Version: 7.0
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    Java [Click for support]
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 499.25 GB Disk used: 327.65 GB
    Destinations:
        USB-HDD [Local]
        Total size: 640.13 GB
        Total number of backups: 50
        Oldest backup: 2014-10-28 10:29:00 +0000
        Last backup: 2015-04-17 06:41:54 +0000
        Size of backup disk: Too small
            Backup size 640.13 GB < (Disk used 327.65 GB X 3)
Top Processes by CPU: ℹ️
         3%    WindowServer
         0%    fontd
         0%    taskgated
         0%    AppleSpell
         0%    notifyd
Top Processes by Memory: ℹ️
    451 MB    softwareupdated
    155 MB    mds_stores
    103 MB    ocspd
    64 MB    SubmitDiagInfo
    64 MB    com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
    7.48 GB    Free RAM
    2.34 GB    Active RAM
    2.20 GB    Inactive RAM
    861 MB    Wired RAM
    2.05 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Apr 17, 2015, 08:30:53 AM    Self test - passed
    Apr 16, 2015, 08:25:32 PM    /Library/Logs/DiagnosticReports/Microsoft Word_2015-04-16-202532_[redacted].cpu_resource.diag [Click for details]
    Apr 16, 2015, 08:37:24 AM    /Library/Logs/DiagnosticReports/com.apple.photos.VideoConversionService_2015-04 -16-083724_[redacted].cpu_resource.diag [Click for details]
    Apr 15, 2015, 08:11:02 PM    /Library/Logs/DiagnosticReports/Microsoft Word_2015-04-15-201102_[redacted].cpu_resource.diag [Click for details]
    Apr 14, 2015, 02:04:13 PM    /Library/Logs/DiagnosticReports/Microsoft Word_2015-04-14-140413_[redacted].cpu_resource.diag [Click for details]
    Apr 14, 2015, 10:12:30 AM    /Library/Logs/DiagnosticReports/iTunes_2015-04-14-101230_[redacted].hang
    Apr 14, 2015, 09:52:05 AM    /Library/Logs/DiagnosticReports/iTunes_2015-04-14-095205_[redacted].hang

There are many possible causes for problems with web browsing. Below are some simple steps that may help either to solve the problem or isolate the cause.
Back up all data before making any changes.
1. Restart your router and also your broadband device, if they're separate.
2. If you connect to the the router with Wi-Fi, turn off Wi-Fi and then back on.
3. If you connect with Wi-Fi and you can also connect with Ethernet, do that and turn off Wi-Fi.
4. If your browser is Safari, then from the Safari menu bar, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. If the Downloads button (with the icon of a downward-pointing arrow) is showing in the toolbar, click it and then click Clear in the box that appears. The download history will be removed.
5. Select the Extensions tab in the Preferences window. Turn all extensions OFF and test. If there's an improvement, turn extensions back ON and then disable them one or a few at a time until you find the culprit.
6. If you're running OS X 10.10 or later, select the Search tab. Uncheck the box marked
          Enable Quick Website Search
if it's checked.
7. If you're running OS X 10.9 or later, select the Advanced tab and uncheck the box marked
          Stop plug-ins to save power
Quit and relaunch the browser.
8. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest.
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
9. Are any other web browsers installed, and are they the same? What about other Internet applications, such as iTunes and the App Store?
10. If other browsers and Internet applications are also affected, follow these instructions and test.
11. If Parental Controls is active for any user, please turn it off and test.
12. Open the iCloud preference pane and uncheck the boxes marked Safari and Photos, if they're checked.
13. Are there any other devices on the same network that can browse the Web, and if so, are they affected?
14. If you can, test Safari on another network.
15. Start up in Recovery mode. In the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. While in Recovery, you'll have no access to your saved bookmarks or passwords, so make a note of those before you begin, if they're needed for the test.

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Since installing OS X 10.8.2 Safari is very slow to open sites

Since installing OS X 10.8.2 Safari is very slow to open sites

Do you get a notice that Safari has quit unexpectedly? If so, please do the following.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the name of the crashed application or process in the Filter text field. Select the messages from the time of the last crash, if any. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in the Console window, look under User Diagnostic Reports for crash reports related to the process. The report name starts with the name of the crashed process, and ends with ".crash". Select the most recent report and post the entire contents — again, the text, not a screenshot. In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

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You're going to have to be more specific and include some details.

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Please answer as many of the following questions as you can. You may already have answered some of them.
1. Have you restarted your router and broadband modem since you first noticed the problem? If the answer is no, do that now and see whether there's any change.
2. Are any other web browsers installed, and are they also slow?
3. What about other Internet applications, such as iTunes and the App Store?
4. Are there any other devices on the same network that can browse the Web, and are they also slow?
5. If you can test Safari on another network, is it slow there too?
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Since several days ago Safari runs very slow. I have cleaned the computer, big files, reseted safari, turned off DNS, turned on again.. and many more tips found but no luck. I would apprecieate you help.
thanks

If you have not done so lately, empty the Safari cache. Press Command + Option + E on your keyboard.
Quit and relaunch Safari to test.
If that didn't help, try troubleshooting plug-ins and extensions ...
From your Safari menu bar click Safari > Preferences then select the Security tab.
Deselect: Allow all other plug-ins. Quit and relaunch Safari to test.
If that made a difference, instructions for troubleshooting plugins here.
If it's not a plug-in issue, select the Extensions tab. If there are any extensions installed, turn that OFF, quit and relaunch Safari to test. If that made a difference, uninstall one at a time, quit and relaunch Safari to test until you find the culprit.
When you post, it helps to tell us which OS X your Mac has installed, and in this case, which version of Safari.
Select About This Mac from your Apple menu to see the OS X version
For Safari click Safari > About Safari
message edited by: cs

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Please answer as many of the following questions as you can. You may already have answered some of them. In that case, there's no need to repeat the answers.
Have you restarted your router and your broadband device (if they're separate) since you first noticed the problem? If not, do that now and see whether there's any change.
If your browser is Safari, then from the Safari menu bar, select
Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. Any change?
If you're running OS X 10.9 or later, select the Advanced tab in the Preferences window and uncheck the box marked
Stop plug-ins to save power
Any change?
Quit and relaunch the browser. Any change?
Log out and log back in. Any change?
Enable Private Browsing in the Safari menu. Any change?
Are any other web browsers installed, and are they the same? What about other Internet applications, such as iTunes and the App Store?
If other browsers and Internet applications are also affected, follow these instructions and test. Any change?
If Parental Controls is active for any user, please turn it off and test. Any change?
If only Safari is affected, launch the Activity Monitor application and enter "web" (without the quotes) in the search box. If a process named "Safari Web Content" is shown in red or is using more than about 5% of a CPU, select it and force it to quit by clicking the X or Quit Process button in the toolbar of the window. There may be more than one such process. Any improvement?
Again, if only Safari is involved, open the iCloud preference pane and uncheck the box marked Safari, if it's checked. Any change?
Are there any other devices on the same network that can browse the Web, and are they affected?
If you can test Safari on another network, is it the same there?
If you connect to your router with Wi-Fi and you can also connect with Ethernet, do that and turn off Wi-Fi. Any difference?

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I hope someone can help me.
P.S. Sorry for my english, not my first language.

Do you get a notice that Safari has quit unexpectedly? If so, please do the following.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the name of the crashed application or process in the Filter text field. Select the messages from the time of the last crash, if any. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in the Console window, look under User Diagnostic Reports for crash reports related to the process. The report name starts with the name of the crashed process, and ends with ".crash". Select the most recent report and post the entire contents — again, the text, not a screenshot. In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

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