A couple of things that may help sort your hungry hungry Safari:
Unsupported third-party add-ons may add features to Safari or change its appearance. If you use unsupported third-party add-ons you may encounter issues such as these:
- Safari quits unexpectedly
- Safari runs slowly
- Safari is unable to download files
- Other unexpected behavior
Note: This article does not apply to Internet Plug-Ins such as QuickTime, Java and Adobe Flash. It also does not apply to Safari Extensions.
The article goes on to describe where to look for these add-ons, and how to remove them and determine which (if any) may be causing issues.
Furthermore, the same process can be applied to Safari Extensions:
Off/On switch | To turn all extensions on or off, click the switch. For certain extensions, the change does not take effect until you navigate to a new page.
Once all extensions are disabled, try enabling one at a time and testing to see if the issue occurs, until you locate the offending add-on or extension.