IMac 27" slow down with dual screen

Hello,
I just bought a iMac 27" i5. i was really happy about it, until i plugged a extra screen on it !
As soon as i put an extra screen (in DVI), my iMac get slow, and freeze for few instants !
It's really noticeable, when i move the mouse, and it stay stuck and doesn't move smoothly
When i remove the extra screen, it's not slow anymore, everything goes back to normal immediately !
what's happening ?
does that happend to someone else ?
sorry about my poor english
PS : i try to restart the iMac, i tried to put down both screen resolution, i tried to plug a différent screen, to run it with and without any application open... nothing change !

read this thread
http://discussions.apple.com/thread.jspa?messageID=11211154

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Here is my xmonad.hs
import XMonad
import System.Exit
import qualified XMonad.StackSet as W
import qualified Data.Map as M
import XMonad.Util.Run
import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks
import XMonad.Layout.NoBorders
import XMonad.Hooks.SetWMName
import XMonad.Hooks.ManageHelpers (isFullscreen, doFullFloat, doCenterFloat)
import XMonad.Layout.Tabbed
import System.IO
-- -xos4-terminus-medium-r-*-*-14-*-*-*-*-*-*-*
myLauncher :: String
myLauncher = "`dmenu_path | dmenu -fn '-xos4-terminus-medium-r-*-*-14-*-*-*-*-*-*-*' -nb '#303030' -nf '#959595' -sf '#FFFFFF' -sb '#606060'`"
myKeys conf@(XConfig {XMonad.modMask = modMask}) = M.fromList $
[ ((modMask .|. shiftMask, xK_Return), spawn $ XMonad.terminal conf)
, ((modMask, xK_p ), spawn myLauncher)
, ((modMask .|. shiftMask, xK_c ), kill)
, ((mod4Mask .|. controlMask, xK_Down ), spawn "/home/hardik/bin/decrease-aumix-vol.sh")
, ((0 , 0x1008ff11 ), spawn "/home/hardik/bin/decrease-aumix-vol.sh")
, ((mod4Mask .|. controlMask, xK_Up ), spawn "/home/hardik/bin/increase-aumix-vol.sh")
, ((0 , 0x1008ff13 ), spawn "/home/hardik/bin/increase-aumix-vol.sh")
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, ((0 , 0x1008ff12 ), spawn "/home/hardik/bin/toggle-aumix-mute.sh")
, ((modMask, xK_space ), sendMessage NextLayout)
, ((modMask .|. shiftMask, xK_space ), setLayout $ XMonad.layoutHook conf)
, ((modMask, xK_n ), refresh)
, ((modMask, xK_Tab ), windows W.focusDown)
, ((modMask, xK_j ), windows W.focusDown)
, ((modMask, xK_k ), windows W.focusUp )
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, ((modMask, xK_Return), windows W.swapMaster)
, ((modMask .|. shiftMask, xK_j ), windows W.swapDown )
, ((modMask .|. shiftMask, xK_k ), windows W.swapUp ) , ((modMask, xK_h ), sendMessage Shrink) , ((modMask, xK_l ), sendMessage Expand)
, ((modMask, xK_t ), withFocused $ windows . W.sink)
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, ((modMask , xK_period), sendMessage (IncMasterN (-1)))
, ((modMask .|. shiftMask, xK_q ), io (exitWith ExitSuccess))
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, ((modMask , xK_q ), spawn "killall conky dzen2 && xmonad --recompile && xmonad --restart")
, ((modMask .|.shiftMask .|. controlMask , xK_c ), spawn "emacs ~/.xmonad/xmonad.hs")
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, ((modMask , xK_b ), sendMessage ToggleStruts)
++
[((m .|. controlMask, k), windows $ f i)
| (i, k) <- zip (XMonad.workspaces conf) [xK_F1 .. xK_F4]
, (f, m) <- [(W.view, 0), (W.shift, shiftMask)]]
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++
-- mod-{w,e,r}, Switch to physical/Xinerama screens 1, 2, or 3
-- mod-shift-{w,e,r}, Move client to screen 1, 2, or 3
[((m .|. modMask, key), screenWorkspace sc >>= flip whenJust (windows . f))
| (key, sc) <- zip [xK_w, xK_e] [0..]
, (f, m) <- [(W.view, 0), (W.shift, shiftMask)]]
myMouseBindings (XConfig {XMonad.modMask = modMask}) = M.fromList $
[ ((modMask, button1), (\w -> focus w >> mouseMoveWindow w))
, ((modMask, button2), (\w -> focus w >> windows W.swapMaster))
, ((modMask, button3), (\w -> focus w >> mouseResizeWindow w))
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where
tiled = Tall 1 (2/100) (1/2)
myManageHook = composeAll
[ className =? "MPlayer" --> doFloat
, className =? "Gimp" --> doFloat
, className =? "Gimp" --> doFloat
, className =? "IDEA" --> doFloat
, resource =? "desktop_window" --> doIgnore
, isFullscreen --> doFullFloat ]
myStartupHook :: X ()
myStartupHook = do
setWMName "LG3D"
spawn "xset -b"
spawn "xrdb -load ~/.Xdafaults"
spawn "xscreensaver -no-splash"
spawn "numlockx on"
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spawn "conky -c ~/.conkyrc_dzen | dzen2 -ta r -x 600 -bg '#303030' -fn '-*-lucida-*-*-normal-*-12-*-*-*-*-*-*-*' &"
spawn "conky &"
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shortened :: Int -> String -> String
shortened n xs | length xs < n = xs
| otherwise = (take ( n - length end) xs) ++ end
where
end = "..."
main = do
h <- spawnPipe "dzen2 -w 600 -ta l -fn ' -*-lucida-*-*-normal-*-12-*-*-*-*-*-*-*' -bg '#303030' -fg '#FFFFFF'"
xmonad $ defaultConfig {
terminal = "urxvt",
focusFollowsMouse = True,
borderWidth = 1,
modMask = mod1Mask,
workspaces = [" console "," dev "," misc "," browser "],
normalBorderColor = "#303030",
focusedBorderColor = "#55BBFF",
keys = myKeys,
mouseBindings = myMouseBindings,
layoutHook = avoidStruts $ smartBorders myLayouts,
manageHook = myManageHook <+> manageDocks,
startupHook = myStartupHook,
logHook = dynamicLogWithPP $ defaultPP {
ppCurrent = wrap "^fg(#FFFFFF)^bg(#606060)" "^fg()^bg()"
,ppVisible = wrap "^fg(#FFFFFF)^bg()" "^fg()^bg()"
,ppHidden = wrap "^fg(#55BBFF)^bg()" "^fg()^bg()"
,ppHiddenNoWindows = wrap "^fg(#808080)^bg()" "^fg()^bg()"
,ppUrgent = wrap "^fg(#FF0000)^bg()" "^fg()^bg()"
,ppTitle = \x -> if null x
then ""
else "< ^fg(#FFFFFF)^bg()" ++ shortened 23 x ++ "^fg()^bg() >"
,ppLayout = \x -> "^fg(#FFBB00)^bg()"
++ case x of
"Tall" -> "Tiled"
"Full" -> "Full"
"Mirror Tall" -> "Tiled Bottom"
"Tabbed Bottom Simplest" -> "Tabbed"
_ -> x
++ "^fg()^bg()"
,ppSep = " "
,ppWsSep = ""
,ppOutput = hPutStrLn h
Last edited by rangalo (2010-04-22 14:52:13)

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Problem description:
machine slows down when I go to sites that use video (ifirstrowsports.eu as an example) or memory (wix site creation tools)
EtreCheck version: 2.1.8 (121)
Report generated March 1, 2015 2:34:52 PM PST
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 (27-inch, Mid 2010) (Technical Specifications)
    iMac - model: iMac11,3
    1 2.93 GHz Intel Core i7 CPU: 4-core
    4 GB RAM
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 0/DIMM1
            Empty
        BANK 1/DIMM1
            Empty
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    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 5750 - VRAM: 1024 MB
        iMac 2560 x 1440
        spdisplays_display_connector
System Software: ℹ️
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        - (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 999.86 GB (581.16 GB free)
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Kernel Extensions: ℹ️
        /Library/Parallels/Parallels Service.app
    [loaded]    com.parallels.kext.prl_hid_hook (7.0 15106.786747) [Click for support]
    [loaded]    com.parallels.kext.prl_hypervisor (7.0 15106.786747) [Click for support]
    [loaded]    com.parallels.kext.prl_netbridge (7.0 15106.786747) [Click for support]
    [loaded]    com.parallels.kext.prl_vnic (7.0 15106.786747) [Click for support]
        /System/Library/Extensions
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    [loaded]    com.parallels.kext.prl_usb_connect (7.0 15106.786747) [Click for support]
Startup Items: ℹ️
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Problem System Launch Daemons: ℹ️
    [not loaded]    org.samba.winbindd.plist [Click for support]
Launch Agents: ℹ️
    [running]    com.mcafee.menulet.plist [Click for support]
    [running]    com.mcafee.reporter.plist [Click for support]
    [loaded]    com.parallels.desktop.launch.plist [Click for support]
    [loaded]    com.parallels.DesktopControlAgent.plist [Click for support]
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    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [running]    com.fitbit.fitbitd.plist [Click for support]
    [running]    com.fitbit.galileod.plist [Click for support]
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    [loaded]    com.sonos.smbbump.plist [Click for support]
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    Google Drive    Application (/Applications/Google Drive.app)
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    Google Chrome    Application Hidden (/Applications/Google Chrome.app)
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    JavaAppletPlugin: Version: 13.9.8 - SDK 10.6 Check version
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    EPPEX Plugin: Version: 3.0.5.0 [Click for support]
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.6.6
    OfficeLiveBrowserPlugin: Version: 12.3.3 [Click for support]
    SiteAdvisor: Version: 2.0 - SDK 10.1 [Click for support]
    Silverlight: Version: 5.1.20125.0 - SDK 10.6 [Click for support]
    iPhotoPhotocast: Version: 7.0 - SDK 10.7
User internet Plug-ins: ℹ️
    CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 [Click for support]
Safari Extensions: ℹ️
    SiteAdvisor
Audio Plug-ins: ℹ️
    iSightAudio: Version: 7.6.6
3rd Party Preference Panes: ℹ️
    3ivx MPEG-4 [Click for support]
    Flash Player [Click for support]
    handyPrint [Click for support]
Time Machine: ℹ️
    Time Machine information requires OS X 10.7 "Lion" or later.
Top Processes by CPU: ℹ️
        89%    Google Drive
        42%    storeagent
        30%    syslogd
        29%    mDNSResponder
         1%    VShieldScanManager
Top Processes by Memory: ℹ️
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    193 MB    App Store
    125 MB    Google Chrome Helper
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    82 MB    mds
Virtual Memory Information: ℹ️
    1.48 GB    Free RAM
    1.57 GB    Active RAM
    667 MB    Inactive RAM
    572 MB    Wired RAM
    44.20 GB    Page-ins
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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It's like it has a time delay on everything now. Everything is sooooo slow.
Also before i updated the OS there was this sound coming off the computer like it was doing something in the background, a sort of rustling/crinkling noise from the drive i think. When it makes this sound the computer will slow down and display that little spinning disc icon until the sound went away and then it would speed up again. This was another reason i wanted to wipe my drive and update my software. That sound is almost constant now.
I wanted to wipe my entire hard drive and install the Snow Leopard on a fresh new system. I usually do this once a year to get rid of any unwanted junk on my computer but i never realised that the Snow Leopard disc doesn't give you the option of 'Erase and Install'.
So, do i need to install Tiger with the 'Erase and Install' option, creating a fresh system, then install Snow Leopard and update it?
Also would installing new RAM improve my mac's performance? (MichelPM, thanks for your suggestion)
There's one on ebay made by Sandisk for sale at £30. It's 2GB and seems like the best option. It's listed below.
I have 1GB on board now so that would make it 3GB.
Would doing this get rid of these unwanted and very annoying sounds and time delays?
If i have to hear that rustling or see that little coloured disc for much longer i am going to lose it.
Thanks for you time.
http://www.ebay.co.uk/itm/2GB-Ram-Memory-Apple-iMac-2-16GHz-Intel-Core-2-Duo-iMa c-2-4GHz-Intel-Core-2-Duo?item=260992423037&cmd=ViewItem&_trksid=p5197.m7&_trkpa rms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D899659199115 7919118#ht_4483wt_1165

Hello,
Thanks for the help everyone.
First, i have all my data/files backed up on my older Lacie drives. New ones are still in their boxes.
Second, the noise with the disc. It's not a clicking sound. It's more like the drive is struggling to do something.
It's not continuous, It happens when opening up itunes or iphoto or another app. Or when i try to open up a page on Safari, the page will start to load, the noise will start and either the noise stops and the page loads or the page stalls and the sound continues and then i just hit reload or quit Safari depending on how annoyed i am at the time! It did do this before i updated to SL but it seems to be more and more now!
If i have Safari, iPhoto and Mail open all at once, it's like a battle over what get's done with the sound creaking away and the spinning icon all over the place.
How do i check my drive using Disk Utility? Do i 'verify' it? I have done it before but it was a long time ago.
I never did a clean install. I just put in SL and let it update, then i updated the software to 10.6.8.
I will do that when i get the new RAM however just to start afresh.
I have bought a 2GB Crucial RAM memory (Thanks RadiationMac) but do i need to buy another one now?
Also how would spotlight make noise?
Thank you. These forums are invaluable.

Problems with dual screens

I am running an iMac 3.06 GHz, 4 GB RAM, 512 VRAM. I also use an external monitor connected via HDMI. When I run Color using dual screens the picture shows almost only black, and what isn't black is so saturated I can barely discern what the picture is. Does anyone know why this is happening and/or how I can fix it?

I'm not sure Color works properly with monitors connected in that manner. Color isn't accurate without proper monitoring, and you can't get proper monitoring with an iMac. By proper monitoring I mean an HDTV or broadcast monitor being fed a VIDEO signal via a hardware capture card (AJA, Decklink, Matrox). You can't get capture cards to work on iMacs, therefore you cannot properly monitor a video signal.
The display in the Color interface is not accurate at all. It is just a reference to see what frame you are on. It isn't designed to be used to judge the quality of the image. It has a much higher gamma (midrange) than is seen on the external monitor.
I'm assuming the monitor you are using is being fed a converted HDMI signal...converted from the DVI or Mini Display port on the computer. Well, that is a computer signal...not a video one. There's a difference. So this setup will not work...not with Color.
Sorry,
Shane

IMac 27" slow down with dual screen

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