I'm experiencing similar behavior in the past couple months. I've noticed this happening on a lot of sites which has caused slowdowns in my system but today MacOS actually paused Orion because it was taking too much memory.
I have three tabs open:
- Nextcloud
- Immich
- Orionfeedback.org
Really the only step I took was downloading in Nextcloud (it's a large folder... 1.3 GB). Before downloading, Orion was using 350 MB of memory. During download I can see the processes for Immich and Nextcloud increasing to around 600-800 MB each and remains stable but the process for Orion rapidly increases up to 35 GB. MacOS prompts me to kill Orion and the download never completes.

I've tried it in Safari and Chrome. Neither have this issue and are able to download much larger folders (3 GB).
I've used Orion as my daily driver since it came out and haven't had this issue. It's definitely recent.