OT: I appreciate that most people want a simple, lightweight reader. But for myself, can someone recommend a sophisticated RSS reader for power users? I need to

OT: I appreciate that most people want a simple, lightweight reader. But for myself, can someone recommend a sophisticated RSS reader for power users? I need to process feeds as efficiently as possible; a serious bottleneck is simply reading all the headlines to find the articles I want (and I'm picky about the feeds I download). I don't want simple, I want fast; I don't care about complexity or a learning curve, as long as it doesn't delay me as a user. I want the Vim (or Emacs?) of feed readers: * Immediate responsiveness, especially displaying article content * Information-dense, well-designed UI, so my eyes can skim headlines quickly. * Search and sort * Deduplication * Automatic grouping: This feature would reduce the headlines I need to review by 50% or more, I would guess. Group articles regarding the same topic, similar to what Google News does (but with my feeds and a more information-dense UI). For example, automatically group articles about the new Samsung wearable announcement, so I can choose the best one to read or simply delete them all. * Filtering: Based on headers or full-text, especially to highlight my favorite feeds and authors. * Analytics: Which feeds, authors, etc. do I read the most? From which do I open the full article the most (I download all summaries, for speed)? It would help me weed out less productive feeds. * Efficient management of feeds: Auto-discover changed feed URLs, etc. * Security: No external connections from within articles without user confirmation. That is, no image downloads, beacons, etc. No JavaScript. I'd happily pay > $100 for all that.