Whoogle is a Google anonymizer and stripper-of-chaff, searx is a content aggregator on top of that same concept. While similar in the first context, searx provides a secondary layer of interacting with many search engines for well rounded content. Nothing wrong with whoogle, just not an exact 1-to-1 comparison. (cannot speak to your issues with speed and bugs, I suggest opening an issue on their Github and explaining your problems or a dedicated user forum maybe reddit?)