Reckless 0.10.0-dev-7300f044 has a performance problem. Users report serious slowdowns when running the engine with pv=2 and worse degradation at pv=3 and higher principal variation settings.
This matters because principal variation display is how analysts and engine users see what the engine considers its best lines. Higher pv values mean deeper, more informative analysis. If an engine tanks in speed at pv=3, you either get slower analysis or drop back to lower settings and lose information.
The complaint came from the TalkChess forum, where engine development gets scrutinized heavily. Reckless is an open-source UCI engine in active development, so these kinds of issues get reported and fixed quickly by the community. But right now, this dev build has a regression that makes it less useful for serious analysis work.
THE BOTTOM LINE: Reckless 0.10.0-dev has performance issues at higher pv settings that make it sluggish for detailed analysis.