@pyxlwuff That's probably expected due to page cache RAM usage on the guest. By default muvm allocates up to 80% of the host memory, so if you're using more than 20% on host-side apps then you'll probably OOM sooner or later. You can control this with muvm --mem=X.

This will be improved once we enable virtiofs DAX later on, since that makes the guest and host share the filesystem cache pages, so guest RAM usage should largely be true RAM usage.