Safari Web Content - Constantly using CPU time even when no tabs

Hello,
I have a MacBook Pro Retina (2012), with 16GB of RAM. It is running OSX Mavericks (10.9.4). Recently, I have switched from using it with multiple external monitors, to using it on its own. Here, I have noticed unusually raised usage temperatures - even without any applications (other than Safari) running. Looking at Activity Monitor, it seems Safari Web Content (com.apple.WebKit.WebContent) is constantly using one of my CPUs. Whilst it does not affect the speed of the computer much, it does mean that "idle" temperatures are significantly raised, which is a pain when I am using it on the road.
I have done the following, all of which have not succeeded:
Disabled all Safari extensions
Cleared the cache
Closed all tabs
Sampled the process - unsure of what the output of this means, but if you require it, then I can post it here.
I am unsure what else to try. Currently, the only action that resolves the issue is completely quitting Safari - obviously, this isn't something I can really do for normal usage.
Has anybody come across this before? Is there anything more I can do to investigate the issue? Finally, is there a known fix for this problem?
Thank you in advance,
Richard

Do you have any of the following installed:
anti-virus/internet security software?
"Cleaning" or "tuning" software?
third-party backup software (not Apple's Time Machine) that came bundled with an external hard drive?
online backup software (Carbonite, OneDrive, GoogleDrive)?
Also please do "About Safari" from your Safari menu so we can verify your version. On July 11, Apple inadvertently posted a Seed release of a Safari version still under development for the next OSX version. People who had updates set to "automatic" got the "not ready for prime time" version. If you have Safari 7.1, you were "gifted" with that little bag of post-processed cattle feed.

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Message was edited by: joelfriedman

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When you have the problem, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above. Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first. Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
☞ The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
☞ Some private information, such as your name, may appear in the log. Anonymize before posting.

Safari Web Content - Constantly using CPU time even when no tabs

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