I'm new to Orion (started using on the 5th of September) and I have seen the same issue from the start of my use. I'm slightly lost as to which thread to report in, I see a few active.
The symptoms I see are websites becoming very slow when using, and tabs seemingly becoming non-responsive. Restarting Orion fixes the problem for while. The tab issue is very rare, but the slowing websites seem to be daily.
I noticed on one restart of the browser, in Activity Monitor, that there was an Orion extension process that was using > 90% CPU. But I didn't see that on the next slowdown occurence. I've just seen the Google Calendar process usage sitting at 100%. I've killed that with Activity Monitor, and I now see the Orion Web Content process sitting at 100%. Orion Web Content was at 100% for no longer than 10 min. However I have just seen another process for a tab that is pinned but not in focus leap to 90% for about 15 seconds before dropping back. I’ve been monitoring for the last hour while using Orion, and I haven’t seen this behaviour again.
Generally I see these issues occur after several solid hours of use. I will have 3 windows with > 30 tabs across these windows (Gmail/Calendar, JIRA, Github are always pinned). I use a similar ridiculous tab setup on Safari and Firefox. I have seen no issues on Safari, but I have rarely seen Firefox failing to load websites or tabs stop working, requiring a Firefox restart (this lead me to start using Orion). I leave my machine and Orion open always (unless I needed to restart Orion).
I have 2 Chrome extensions, 1Password (8.11.10.37) and Consent-o-Matic (1.1.3). I have horizontal tabs. I am using an M1 Pro with 32GB of RAM on macOS 15.6. Orion is at 0.99.136-beta.
I’m extremely excited about switching to Orion on Linux (which lead me to trying Orion on macOS), so I hope these papercuts can be resolved before general release.