Prepare!

Opera users that frequent Symantec.com may notice certain pages triggering an extremely high CPU usage for a short burst of time. For example:

http://www.symantec.com/avcenter/threatcon/

A quick analysis of this CPU issue indicates that one JavaScript file is causing this mess:

http://www.symantec.com/content/en/us/omniture/20070301b/OmniScript.js

...most likely due to its inefficient use of deeply nested loops.

As a temporary work-around, you can simply block this script in Opera using the following pattern in the Block content dialog:

http://*.symantec.com/content/*/omniture/*/OmniScript.js

Reloading the example page above shows the high CPU is now gone -- and virtually no page functionality has been lost by blocking this external JavaScript.

Enjoy.