fix: perf timers

src/Bundle/build.coffee

@@ -86,10 +86,14 @@ build = (bundle, state) ->
   each bundle.packages, (versions, name) ->
     versions.forEach dropUnusedPackage
 
+  concatTimer = elaps 'concatenated %O assets in %t', assets.length
+
   # Concatenate the assets.
-  t3 = elaps 'concatenate assets'
   result = await bundle._concat assets, packages
-  t3.stop()
+
+  if /\bcush\b/.test process.env.DEBUG
+    setImmediate -> concatTimer.stop true
+
   return result
 
 module.exports = build

src/workers/Bundle.coffee

@@ -12,6 +12,8 @@ vm = require 'vm'
 empty = []
 VERBOSE = process.env.VERBOSE is '1'
 
+elaps.log = log
+
 class Bundle
   constructor: (props) ->
     @id = props.id