Repeating FolderActions log messages
The messages are shown because folders in the WatchPaths array of ~/Library/LaunchAgents/com.apple.FolderActions.folders.plist are modified more often than every ten seconds. I don't know any way to change the throttling policy of launchd. But you could get rid of the log messages by just keeping the program running for ten seconds or longer.

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;dict&gt;
    &lt;key&gt;Label&lt;/key&gt;
    &lt;string&gt;com.apple.FolderActions.folders&lt;/string&gt;
    &lt;key&gt;Program&lt;/key&gt;
    &lt;string&gt;/usr/bin/osascript&lt;/string&gt;
    &lt;key&gt;ProgramArguments&lt;/key&gt;
    &lt;array&gt;
        &lt;string&gt;osascript&lt;/string&gt;
        &lt;string&gt;-e&lt;/string&gt;
        &lt;string&gt;tell application "Folder Actions Dispatcher" to tick&lt;/string&gt;
        &lt;string&gt;-e&lt;/string&gt;
        &lt;string&gt;delay 10&lt;/string&gt;
    &lt;/array&gt;
    &lt;key&gt;WatchPaths&lt;/key&gt;
    &lt;array&gt;
        &lt;string&gt;/Users/username/Desktop&lt;/string&gt;
    &lt;/array&gt;
&lt;/dict&gt;
&lt;/plist&gt;


The changes can be applied by reloading the property list or by logging out and back in.

launchctl unload -S Aqua ~/Library/LaunchAgents/com.apple.FolderActions.folders.plist
launchctl load -S Aqua ~/Library/LaunchAgents/com.apple.FolderActions.folders.plist


The property list gets overwritten when you add or remove folders with folder actions in Automator or Folder Actions Setup.