Mac running slowly

Question

My Mac has been running slower than usual for about a week. G-mail and Google are slow. I use Photoshop, but almost all images are in folders. Can the problem be identified and can I get back to normal speed?
Here are the messages from the Console:
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSUpdateCheckAction performAction] KSUpdateCheckAction starting update check for ticket(s): {(
    <KSTicket:0x609bf0
        productID=com.google.talkplugin
        version=4.8.0.15566
        xc=<KSPathExistenceChecker:0x605480 path=/Library/Application Support/Google/GoogleTalkPlugin.app>
        serverType=Omaha
        url=https://tools.google.com/service/update2
        creationDate=2011-10-23 16:01:36
    >,
    <KSTicket:0x218a90
        productID=com.google.Keystone
        version=1.1.0.3659
        xc=<KSPathExistenceChecker:0x205df0 path=/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/>
        serverType=Omaha
        url=https://tools.google.com/service/update2
        creationDate=2011-10-23 16:01:36
    >
Using server: <KSOmahaServer:0x220f00
    engine=<KSDaemonUpdateEngine:0x601bc0>
    params={
        EngineVersion = "1.1.0.3659";
        ActivesInfo = {
            "com.google.Chrome" = {
                LastActivePingDate = 2013-10-13 03:00:00 -0400;
                LastActiveDate = 2013-10-12 17:12:55 -0400;
                LastRollCallPingDate = 2013-10-13 03:00:00 -0400;
            "com.google.Keystone" = {
                LastRollCallPingDate = 2013-10-13 03:00:00 -0400;
                LastActivePingDate = 2013-10-13 03:00:00 -0400;
                LastActiveDate = 2013-10-13 16:55:48 -0400;
            "com.Google.GoogleEarthPlugin.intel" = {
                LastRollCallPingDate = 2013-10-13 03:00:00 -0400;
            "com.google.talkplugin" = {
                LastActivePingDate = 2013-02-27 03:00:00 -0500;
                LastActiveDate = 2013-02-26 17:53:52 -0500;
                LastRollCallPingDate = 2013-10-13 03:00:00 -0400;
        UserInitiated = 0;
        IsSystem = 1;
        OmahaOSVersion = "10.6.8_i486";
        Identity = KeystoneDaemon;
        AllowedSubdomains = (
            ".omaha.sandbox.google.com",
            ".tools.google.com",
            ".www.google.com",
            ".corp.google.com"
>
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSUpdateCheckAction performAction] KSUpdateCheckAction running KSServerUpdateRequest: <KSOmahaServerUpdateRequest:0x222a60
    server=<KSOmahaServer:0x220f00>
    url="https://tools.google.com/service/update2"
    runningFetchers=0
    tickets=2
    activeTickets=0
    rollCallTickets=0
    body=
        <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
        <o:gupdate xmlns:o="http://www.google.com/update2/request" protocol="2.0" version="KeystoneDaemon-1.1.0.3659" ismachine="1">
            <o:os platform="mac" version="MacOSX" sp="10.6.8_i486"></o:os>
            <o:app appid="com.google.talkplugin" version="4.8.0.15566" lang="en-us" installage="721" brand="GGLG">
                <o:updatecheck></o:updatecheck>
            </o:app>
            <o:app appid="com.google.Keystone" version="1.1.0.3659" lang="en-us" installage="721" brand="GGLG">
                <o:updatecheck></o:updatecheck>
            </o:app>
        </o:gupdate>
>
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSUpdateCheckAction(KSServerUpdateRequestDelegate) serverRequest:fetchedWithResponse:] KSUpdateCheckAction received KSServerUpdateResponse: <KSOmahaServerUpdateResponse:0x21e6c0
    server=<KSOmahaServer:0x220f00>
    url="https://tools.google.com/service/update2"
    status=200
    tickets=2
    activeTickets=0
    rollCallTickets=0
    data=
        <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
        <gupdate xmlns="http://www.google.com/update2/response" protocol="2.0" server="prod">
            <daystart elapsed_seconds="50150"></daystart>
            <app appid="com.google.talkplugin" status="ok">
                <updatecheck status="noupdate"></updatecheck>
            </app>
            <app appid="com.google.Keystone" status="ok">
                <updatecheck status="noupdate"></updatecheck>
            </app>
        </gupdate>
>
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSUpdateCheckAction(PrivateMethods) finishAction] KSUpdateCheckAction found updates: {( )}
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSPrefetchAction performAction] KSPrefetchAction no updates to prefetch.
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSMultiUpdateAction performAction] KSSilentUpdateAction had no updates to apply.
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSMultiUpdateAction performAction] KSPromptAction had no updates to apply.
10/13/13 4:55:50 PM    GoogleSoftwareUpdateDaemon[400]    -[KSUpdateEngine(PrivateMethods) updateFinish] KSUpdateEngine update processing complete.
10/13/13 4:55:53 PM    GoogleSoftwareUpdateDaemon[400]    -[KeystoneDaemon logServiceState] GoogleSoftwareUpdate daemon (1.1.0.3659) vending:
    com.google.Keystone.Daemon.UpdateEngine: 1 connection(s)
    com.google.Keystone.Daemon.Administration: 0 connection(s)
10/13/13 4:56:18 PM    GoogleSoftwareUpdateDaemon[400]    -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.
10/13/13 4:58:13 PM    Firewall[62]    GoogleTalkPlugin is listening from 127.0.0.1:50166 proto=6
10/13/13 4:58:13 PM    Firewall[62]    GoogleTalkPlugin is listening from 127.0.0.1:50167 proto=6
10/13/13 5:00:14 PM    [0x0-0x2d02d].org.mozilla.firefox[340]    NOTE: child process received `Goodbye', closing down
10/13/13 5:11:20 PM    [0x0-0x2d02d].org.mozilla.firefox[340]    NOTE: child process received `Goodbye', closing down
10/13/13 5:12:59 PM    [0x0-0x2d02d].org.mozilla.firefox[340]    NOTE: child process received `Goodbye', closing down
10/13/13 5:25:46 PM    ntpd[19]    time reset -1.116688 s
10/13/13 5:30:32 PM    [0x0-0x2d02d].org.mozilla.firefox[340]    NOTE: child process received `Goodbye', closing down

Answer 1

Not much help.
What year, screen size, CPU speed and amount of RAM installed?
What version of OS X is your iMac running?
How full is your Mac's hard drive?
How many applications do you run simultaneously in the background while working in another application?
Do you run any antivirus software on your Mac? Antivirus software can slow down the normal operation of OS X.
Do you run any "crapware" like Mackeeper or any other type of "crapware" like so called hard drive "cleaning" apps?
Have you downloaded and installed any thing recently off of the Internet that might be responsible for your iMac's slowdown.