High browser CPU usage when viewing the search results page?
Posted: Tuesday, July 30, 2019 7:14:40 AM
After doing a search (say for "wedding invitations"), and ending up on the search results page (like https://www.zazzle.com/s/wedding+invitations), the browser seems to be using a lot of CPU.

I've noticed this with Chrome, Firefox, and Safari on macOS.

This is what Chrome's built-in Task Manager shows for me, for example:


Is anyone else experiencing this?
Posted: Tuesday, July 30, 2019 1:27:20 PM
What model of Mac are you running? What year did you purchase it?
Which version of MacOS are you running?
Which version of Chrome are you running?

How long has Chrome been open? When was the last time you restarted the application?
How long as this tab been open?
What extensions or add-ons are currently running in Chrome?
Do you see this same behavior on all search results pages?
Posted: Tuesday, July 30, 2019 2:36:17 PM
It's a MacBook Pro Retina laptop, a few years old, running macOS 10.14.5.

It happens consistently with Chrome 76.0.3809.87, freshly opened. The default extensions from Google are disabled, and no others are installed.

Seems to happen for any search term I try that returns results. It happened for these result pages, for example:
https://www.zazzle.com/s/wedding+invitations
https://www.zazzle.com/s/birthday+cards
https://www.zazzle.com/s/personalized+hockey+pucks
https://www.zazzle.com/s/professional+business+cards

Like I mentioned before, it seems to happen with Safari and Firefox, too.

Steps to reproduce:
1. Open a modern web browser (like Chrome, Firefox, Safari)
2. Open https://www.zazzle.com/
3. Perform a search that returns results, and wait for the results page to finish loading.
4. Check Activity Monitor (macOS) for a browser process using significant CPU.
5. Close the Zazzle search results tab, and check that the CPU utilization has stopped.

For example, I see a "Google Chrome Helper (Renderer)" process consistently showing 100% or more CPU utilization in Activity Monitor on macOS while a Zazzle search results tab is open. Closing the tab stops the CPU usage.

With Firefox on macOS, the process is named "FirefoxCP Web Content", and is consistently showing 95% or more CPU utilization when a Zazzle search results tab is open.
Posted: Tuesday, July 30, 2019 2:43:01 PM
Perfect, thanks for the info.
Posted: Thursday, August 01, 2019 1:35:48 PM
Optimizations are coming with tonight's deploy.
Posted: Monday, August 05, 2019 5:50:22 AM
Thanks for looking into this.

I'm no longer seeing the high CPU usage when a search results page is open.
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