As to why it is slow I do not have the knowledge to tell you, but concerning why you should use it, well maybe because it&#x27;s the only company-backed &quot;Ruby on Android&quot; solution at the moment?<p>Looking at open source world instead, there&#x27;s also Ruboto which leverages JRuby (a Ruby implementation running on JVM). It is currently focusing on supporting JRuby 9000, which would represent an even more interesting speedup. However I&#x27;m not sure it is optimized for a speed test yet. Nonetheless, it would have been interesting to see it compared with other solutions in the writeup...