High CPU when Trello is at foreground on Chrome (89.0.4389.114) Edited

[Bo Hu]

The CPU usage is constantly high at 70% when my simple Trello board is at foreground. It drops to almost zero after I switch to another Chrome tab.

Chrome dev console shows a list of errors:

I guess there is a wild timer that keeps running at foreground which consumes a lot of CPU.

Edit1: I have upgraded Chrome to 90.0.4430.93. The issue is still there.

[Gonchik Tsymzhitov · Accepted solution]

Hi @Bo Hu ,

please share your screenshot to Trello support team as well 

https://trello.com/en/contact#/

if you don't use the chrome extensions and you can reproduce in private mode of browser. 

it's bug

[Bo Hu]

It's caused by a Chrome extension "Selection Highlighter". I have to turn it off as adding "trello.com" to its domain blacklist doesn't work. It must have injected some scripts that break trello.

[Bo Hu]

The same issue occurred again today after I disabled the extension. I have no idea what is the root cause and I'm afraid I don't have more time to investigate into it.

I switched to Safari.