Generating screenshots that are used to preview a page during test creation might result in increased resource consumption on a Content Management (CM) instance. The following message can be found in the logs:
ERROR [Content Testing]: PhantomJS process did not complete before the timeout period elapsed.
To resolve the issue, disable the pre-emptive generation of screenshots by adding the .disabled extension to the Sitecore.ContentTesting.PreemptiveScreenshot.config file located in one of the following root folders (depending on your product version):
Note: You can safely disable the pre-emptive screenshot generation functionality because it is optional, and screenshots are generated at run time when creating a test.