title: "UI updates were forcibly disabled by application"
body: <p>I am working a new version of one of my apps, Time Out, which uses a login item helper for scheduling.  A couple of my alpha testers are reporting memory leaks and excessive CPU usage... but I can't reproduce either.</p>
  
  <p>In particular, they mention sluggish performance, and a lot of console logging like the following.  What could be causing this?</p>
  
  <pre><code>1/18/14 3:06:21.754 PM WindowServer[139]: disable_update_timeout: UI updates were forcibly disabled by application "com.dejal.timeout.scheduler" for over 1.00 seconds. Server has re-enabled them.
  1/18/14 3:06:21.986 PM WindowServer[139]: common_reenable_update: UI updates were finally reenabled by application "com.dejal.timeout.scheduler" after 1.23 seconds (server forcibly re-enabled them after 1.00 seconds)
  1/18/14 3:26:54.418 PM WindowServer[139]: disable_update_timeout: UI updates were forcibly disabled by application "com.dejal.timeout.scheduler" for over 1.00 seconds. Server has re-enabled them.
  1/18/14 3:26:55.122 PM WindowServer[139]: common_reenable_update: UI updates were finally reenabled by application "com.dejal.timeout.scheduler" after 1.72 seconds (server forcibly re-enabled them after 1.01 seconds)
  1/18/14 3:31:21.083 PM WindowServer[139]: disable_update_timeout: UI updates were forcibly disabled by application "com.dejal.timeout.scheduler" for over 1.00 seconds. Server has re-enabled them.
  1/18/14 3:31:21.197 PM WindowServer[139]: common_reenable_update: UI updates were finally reenabled by application "com.dejal.timeout.scheduler" after 1.12 seconds (server forcibly re-enabled them after 1.00 seconds)
  </code></pre>