Mac slow after clean install, what should I do? My mac was so painful slow so I had to do clean install but the problem still.

Obs: I have one Macbook pro 13' 2012 with i5 and 4gb of ram. 

Edit: After the install took 12 hours, the problem still here's the log

Edit: Safe mode on don't stop this errors

Edit: I did a clean install, because I am a developer and I need my mac 100%, but when I open any app take minutes to open, the worst its finder and spotlight, I dont know what could happen to him... ): Installing the yosemite again take 9 hours or more, I am thinking in sell it and take one windows, this problem upset me.

13/05/15 09:09:56,121 com.apple.xpc.launchd[1]: (com.apple.watchdogd) Service only ran for 1 seconds. Pushing respawn out by 9 seconds.
13/05/15 09:10:03,512 lsuseractivityd[484]: -[LSUserActivityClientProcess doUpdateUserActivityInfo:makeCurrent:completionHandler:], refusing to register user activity from client, and returning error Error Domain=LSContinuityErrorDomain Code=-108 "The operation couldn’t be completed. (LSContinuityErrorDomain error -108.)" for item &lt;__NSConcreteUUID 0x7fa7e970f1c0&gt; 88E931D2-F97C-4125-A01B-BD9A0A38C8E1 NSUserActivityTypeBrowsingWeb (LSUserActivityClientProcess.m #1148)
13/05/15 09:10:07,959 watchdogd[565]:  [watchdog_daemon] @(    wd_watchdog_open) - IOIteratorNext failed (kr=0)
13/05/15 09:10:07,960 watchdogd[565]:  [watchdog_daemon] @(      wd_daemon_init) - could not initialize the hardware watchdog
13/05/15 09:10:07,960 watchdogd[565]:  [watchdog_daemon] @(                main) - cannot initialize the watchdog service
13/05/15 09:10:07,964 com.apple.xpc.launchd[1]: (com.apple.watchdogd) Service only ran for 2 seconds. Pushing respawn out by 8 seconds.
13/05/15 09:10:16,089 watchdogd[566]:  [watchdog_daemon] @(    wd_watchdog_open) - IOIteratorNext failed (kr=0)
13/05/15 09:10:16,089 watchdogd[566]:  [watchdog_daemon] @(      wd_daemon_init) - could not initialize the hardware watchdog
13/05/15 09:10:16,089 watchdogd[566]:  [watchdog_daemon] @(                main) - cannot initialize the watchdog service
13/05/15 09:10:16,094 com.apple.xpc.launchd[1]: (com.apple.watchdogd) Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
The log shows you having problems with iCloud.

Here is one way to fix that.

Open the iCloud pane in System Preferences and uncheck the box marked iCloud Drive. 

You'll be warned that your iCloud documents will be deleted. ->Confirm. 

They won't be deleted from the server. 

Check the box again and test.