benchmark.rb

[4] pry(main)> Benchmark.ips do |x|
[4] pry(main)*   x.report("freeze") { ENV["PATH_INFO".freeze] }   
[4] pry(main)*   x.report("unfrozen") { ENV["PATH_INFO"] }  
[4] pry(main)*   x.compare!
[4] pry(main)* end  
Calculating -------------------------------------
              freeze     4.722k i/100ms
            unfrozen     4.687k i/100ms
-------------------------------------------------
              freeze      4.309M (±13.4%) i/s -     20.560M
            unfrozen      3.340M (±14.5%) i/s -     15.336M

Comparison:
              freeze:  4309010.1 i/s
            unfrozen:  3339758.2 i/s - 1.29x slower