@SlackHQ The Slack Helper process for some reason has just recently starting pegging at 100% CPU on Big Sur over the last few days. As soon as I quit, it goes away. Rebooting doesn't fix the issue.
We're sorry for the hassle, Chris. Can you make sure you're using the latest version of the Slack app for Mac (4.11.3)? If not, try updating it. In case the issue continues, please email feedback@slack.com so we can take a closer look.