How can I get rid of CGXDisableUpdate delays ?

My computer hangs (freezes, does not respond to inputs) occationally when using Aperture (Apterture shows the "loading" label meanwhile), it hangs for one to several seconds and then everyting is ok again.

I have found the follwing in the console:

2013-08-18 14:00:37,649 WindowServer[233]: CGXDisableUpdate: UI updates were forcibly disabled by application "Aperture" for over 1.00 seconds. Server has re-enabled them.

2013-08-18 14:00:37,669 WindowServer[233]: reenable_update_for_connection: UI updates were finally reenabled by application "Aperture" after 2.49 seconds (server forcibly re-enabled them after 2.47 seconds)

2013-08-18 14:00:39,891 WindowServer[233]: CGXDisableUpdate: UI updates were forcibly disabled by application "Aperture" for over 1.00 seconds. Server has re-enabled them.

2013-08-18 14:00:39,919 WindowServer[233]: reenable_update_for_connection: UI updates were finally reenabled by application "Aperture" after 1.08 seconds (server forcibly re-enabled them after 1.05 seconds)

The lines above are repeded many times, with different time values. Those lines corresponds to the moment I experience that Aperture hangs.

I have searched the ASC for this problem but have not found any solution. Does anyone have any idea? Thank you in advance.

Below is information about my system:

Hardware Information:

iMac (27-inch, Late 2012)

iMac - model: iMac13,2

1 3.2 GHz Intel Core i5 CPU: 4 cores

24 GB RAM

Video Information:

NVIDIA GeForce GTX 675MX - VRAM: 1024 MB

System Software:

OS X 10.8.4 (12E55) - Uptime: 1 day 6:40:36

Disk Information:

APPLE SSD SM768E disk0 : (751,28 GB)

disk0s1 (disk0s1) <not mounted>: 209,7 MB

Macintosh HD (disk0s2) /: 750,42 GB (224,14 GB free)

Recovery HD (disk0s3) <not mounted>: 650 MB

USB Information:

Apple, Inc. Keyboard Hub

Apple, Inc Apple Keyboard

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Inc. FaceTime HD Camera (Built-in)

FireWire Information:

Thunderbolt Information:

Apple Inc. thunderbolt_bus

Kernel Extensions:

Problem System Launch Daemons:

Problem System Launch Agents:

Launch Daemons:

[not loaded] com.teamviewer.teamviewer_service.plist

[loaded] org.glimmerblocker.proxy.plist

Launch Agents:

[not loaded] com.teamviewer.teamviewer.plist

[not loaded] com.teamviewer.teamviewer_desktop.plist

[loaded] org.glimmerblocker.updater.plist

User Launch Agents:

[loaded] com.google.keystone.agent.plist

[loaded] com.spotify.webhelper.plist

User Login Items:

iTunesHelper

Dropbox

3rd Party Preference Panes:

GlimmerBlocker

Internet Plug-ins:

JavaAppletPlugin.plugin

QuickTime Plugin.plugin

User Internet Plug-ins:

Bad Fonts:

None

Top Processes by CPU:

3% Spotify

3% coreaudiod

1% WindowServer

1% Aperture

1% fontd

1% EtreCheck

0% System Events

0% warmd

0% mds

0% WebProcess

Top Processes by Memory:

3.14 GB Aperture

516 MB WebProcess

270 MB WindowServer

98 MB Spotify

98 MB Safari

74 MB Mail

74 MB mds

74 MB GlimmerBlockerProxy

49 MB Finder

25 MB com.apple.security.pboxd

Virtual Memory Statistics

15.57 GB Free RAM

4.77 GB Active RAM

1.56 GB Inactive RAM

2.10 GB Wired RAM

10.43 GB Page-ins

0 B Page-outs