Performance parity with C
In general, Rust is in the same performance ballpark as C for code >written in Rust (sometimes it’s even faster). However, the cost of >crossing from Ruby to Rust is still high (compared to Ruby C >extensions).
That being said, because using native code is so much faster than >Ruby, you can recoup the cost difference pretty quickly. This >problem is more important for chatty APIs, or drop-in replacements >for Ruby APIs that intrinsically require a lot of communication with >Ruby (e.g. to_str).
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