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    <p>The reason you are seeing a difference is <em>not</em> related to the implementation of <code>==</code> vs <code>eql?</code> but is due to the fact that Ruby optimizes operators (like <code>==</code>) to avoid going through the normal method lookup when possible.</p> <p>We can verify this in two ways:</p> <ul> <li><p>Create an alias for <code>==</code> and call that instead. You'll get similar results to <code>eql?</code> and thus slower results than <code>==</code>.</p></li> <li><p>Compare using <code>send :==</code> and <code>send :eql?</code> instead and you'll get similar timings; the speed difference disappears because Ruby will only use the optimization for direct calls to the operators, not with using <code>send</code> or <code>__send__</code>.</p></li> </ul> <p>Here's code that shows both:</p> <pre><code>require 'fruity' first = "Woooooha" second = "Woooooha" class String alias same_value? == end compare do with_operator { first == second } with_same_value { first.same_value? second } with_eql { first.eql? second } end compare do with_send_op { first.send :==, second } with_send_eql { first.send :eql?, second } end </code></pre> <p>Results:</p> <pre><code>with_operator is faster than with_same_value by 2x ± 0.1 with_same_value is similar to with_eql with_send_eql is similar to with_send_op </code></pre> <p>If you're the curious, the optimizations for operators are in <a href="https://github.com/ruby/ruby/blob/017f0ffe1822264a8ead114f0b6055805185c0ac/insns.def#L1581-1598" rel="nofollow"><code>insns.def</code></a>.</p> <p><em>Note</em>: this answer applies only to Ruby MRI, I would be surprised if there was a speed difference in JRuby / rubinius, for instance.</p>
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