title: Rails benchmark reports less time than activerecord query
body: <p>I'm trying to benchmark this query:</p>
  
  <pre><code>Person.where(age: 60)
  </code></pre>
  
  <p>When I run it in the console it says:</p>
  
  <blockquote>
    <p>Person Load (1.2ms)  SELECT "people".* FROM "people" WHERE "people"."age" = ?  [["age", 60]]</p>
  </blockquote>
  
  <p>When I benchmark it, it reports 0.17ms</p>
  
  <pre><code>def self.get_ages_sql
    sixties = Person.where(age: 60)
  end
  
  Benchmark.bmbm do |x|
  x.report('sql') {Person.get_ages_sql}
  end
  </code></pre>
  
  <p><strong>Whats the discrepency between:</strong>
  <em>0.17ms</em> (benchmark)
  vs
  <em>1.2ms</em> (reported when I run command in console)</p>