Ruby is undoubtedly one of the fastest development languages, but in terms of web application performance, it does not always show the best results. Programming languages like Python and NodeJS are still faster.
In most cases, the performance of Ruby is weighed down by the database connections and is dependent on the expertise of the developer and how efficiently their code is written. These issues can create a bottleneck for Ruby, resulting in latency.
Twitter struggled with Ruby performance and ended up partially replacing it with code in other languages. Ruby was not completely abandoned, but the system was replaced with Scala solutions.
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