BanzaiMan

$ jruby -v
jruby 1.7.5.dev (1.9.3p392) 2013-09-04 090d5dd on Java HotSpot(TM) 64-Bit Server VM 1.7.0_25-b15 [darwin-x86_64]
$ time jruby -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xverify:none -e 'require "rails"'
jruby -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xverify:none -e   5.18s user 0.47s system 136% cpu 4.142 total
$ time jruby -e 'require "rails"'                    
jruby -e 'require "rails"'  14.60s user 0.44s system 202% cpu 7.444 total

madrobby

// comments welcome, there may be better ways to do this!

function supportsSVG(){
 return !!('createElementNS' in document &&
   document.createElementNS('http://www.w3.org/2000/svg','svg').createSVGRect)
}