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Fans are running at ~50% since I turned my MBP on this morning and this is a snapshot of the CPU use, it's crazy for 40 tabs open (I often have >100 tabs with several devoted to thread hungry social media sites like twitter and facebook).

Processes in Activity Monitor sorted by CPU Time: Sorted by CPU Time

Processes in Activity Monitor sorted by % CPU (changes order dramatically each few seconds): Sorted by % CPU (changes order dramatically each few seconds)

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    Looks like one Chrome tab has gone crazy - did you try just killing that tab? [Each helper is, in effect, a tab.] – Tetsujin Sep 29 '17 at 6:22
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    Chrome has its own Task Manager: Window > Task Manager. This may help you figure out what is causing it. It shows tabs and extensions. If it's a tab, close it. Reloading the page could also possibly resolve it though. You might want to get Chrome extension: The Great Suspender, which will manually or automatically suspend stale tabs. If it's an extension, when you may want to remove or disable that extension. – Joonas Sep 29 '17 at 7:13
  • "Stale tabs" is a bit misleading. What I meant was: "tabs that you haven't looked at in a while". You can for example set the extension to suspend a tab after 30 minutes of inactivity. It does also have options to make sure that it doesn't suspend a specific site/tab. – Joonas Sep 29 '17 at 7:52
  • Thanks @Tetsujin, that did the trick, I forgot you can quit processes without quitting the application. Fans have slowed, CPU 90% idle now! – wide_eyed_pupil Sep 29 '17 at 8:29
  • @Joonas the Chrome Task Manager is new for me, will check it out looks like just what ive been looking for! When you say inactive, does that mean no user interaction or none of it's own activity, Twitter I've noticed is a big user of CPU and memory and is constantly updating the "new tweets" button count. – wide_eyed_pupil Sep 29 '17 at 8:32
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As pointed out by @Tetsujin the Chrome Helper process at the head of the lists had "gone crazy" and was consuming all spare CPU cycles. Double clicking it and quitting it did the trick.

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I had a similar problem with fans and battery death, and solved it by removing Gmail Offline from Chrome. It was going CRAZY whenever Chrome was running. You can remove it by opening Chrome Apps (the grid of 9 dots in the top left corner of Chrome), right click on the Gmail Offline icon, and Remove it. Much better

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