Wrong tool for the job. If you want to do serious research and archival, use something like DevonThink. I have 20 GB+ worth of stuff there (millions of items including 10 year email history) and it still does full-text search in under 500ms.
I have an information triage process that ends with DEVONThink. I save bookmarks to drafts app, go through them when I have time. And if they are worth it, I save then in DEVONThink where I go through and mark them up.