Instance and local off to the races!

jruby-9.0.5.0.rb

>> Benchmark.ips do |ips|  
 |   ips.report 'local' do  
 |     ex = 1    
 |     ex    
 |   end    
 |     
 |   ips.report 'instance' do  
 |     @ex = 1    
 |     @ex    
 |   end    
 | end   
Warming up --------------------------------------
               local   157.537k i/100ms
            instance   148.740k i/100ms
Calculating -------------------------------------
               local      4.599M (± 5.0%) i/s -     23.000M
            instance      3.769M (± 4.9%) i/s -     18.890M

ruby-2.3.0.rb

>> Benchmark.ips do |ips|  
 |   ips.report 'local' do  
 |     ex = 1    
 |     ex    
 |   end    
 |     
 |   ips.report 'instance' do  
 |     @ex = 1    
 |     @ex    
 |   end    
 | end   
Warming up --------------------------------------
               local   186.040k i/100ms
            instance   153.983k i/100ms
Calculating -------------------------------------
               local     14.143M (± 6.6%) i/s -     70.323M
            instance     13.365M (± 7.7%) i/s -     66.367M