High CPU usage in Chrome/Opera


When I open 1-2 tabs with sites that have many images (e-shop as an example) the CPU usage gets to 100% for Chrome/Opera/Firefox.

What I've tried:

  1. Reset Chrome to default settings
  2. Disabled all extensions
  3. Disabled "Use hardware acceleration" in Chrome settings
  4. Checked task manager in Chrome. Couldn't find anything except that a process called "Browser" takes all the CPU (100%+)
  5. Run malware check on MacOS with 2 different programs (avast and malwarebyte)
  6. Run diagnostics after restarting MacOS

Looks like any browser with webkit engine suddenly started consuming 100% CPU on any site which has at least some dynamic content, maybe images or some JS or something like that. Basically any site.

MacOS version: Big Sur 11.1

CPU: 2,5 GHz Quad-Core Intel Core i7

RAM: 16 GB

Graphics: Intel Iris Pro 1536 MB

Best Answer

Having the same issue. It's not very good even in Safari. I suspect the mtlcompilerservice, as I load pages I see a lot of instances of it in the Activity Monitor, consuming high CPU. TGPro shows high temperature of the CPU, 90+ celcius. Video playback heats up the device but loading pages and browsing around is the worst offender.

I have the 15" mid 2014 model with Iris Pro & Nvidia gt 750m. I thought the reason for overheating/fans-kicking-in-whenever-they-please was that Apple changed some things as to how GPUs work in Big Sur.

I'll try installing Big Sur to a separate volume, and if that doesn't help, I'll re-install macOS, starting from High Sierra and update here.

Idle temp: 54-60 C
Browsing: 70+ C