HT201464: Use Activity Monitor on your Mac
Learn about Use Activity Monitor on your Mac
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Helpful answers
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Sep 15, 2015 3:48 PM in response to jniehoff1037by Linc Davis,Which process is using the most CPU, and how much?
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by Carolyn Samit,Sep 15, 2015 6:14 PM in response to jniehoff1037
Carolyn Samit
Sep 15, 2015 6:14 PM
in response to jniehoff1037
Level 10 (120,143 points)
Apple WatchCould be a Safari extension or third party plug-in, not just the Safari app itself.
From the Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that OFF, quit and relaunch Safari to test.
If that helped, turn one extension on then quit and relaunch Safari to test until you find the incompatible extension then click uninstall.
If it's not an extensions issue, try troubleshooting third party plug-ins.
Back to Safari > Preferences. This time select the Security tab. Deselect: Allow all other plug-ins. Quit and relaunch Safari to test.
If that made a difference, instructions for troubleshooting plugins here.
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Sep 16, 2015 4:15 AM in response to jniehoff1037by OGELTHORPE,Run an Apple hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.