Please be aware: there is currently a bug in Canvas where the mobile app CSS and JS files are loaded into discussions in the browser twice for every discussion post. This means that the more discussion responses there are, the greater lag discussion participants encounter making participating in those discussions exceedingly painful. We (plus Utah State and other Design Tools schools) have reported this to Canvas and they are working on a solution.
Doing the following 2 things will provide some relief while we wait for Canvas to resolve the issue.
Ensure that the mobile app CSS file you're using in your Canvas theme ends with '_app.css'.
For any institutions experiencing this issue, Canvas caches the mobile app files that they are loading somehow so it can take a full day before the new file kicks in.
For a refresher on how to update your mobile app .js and .css files in Canvas please review our last support notice.
Please contact us if you have questions as to how to proceed.