diffs.out

Both against a build that's run at least once.

At git version (on highlights branch) : 2c227d5

With diff below.

$ time perl6 htmlify.p6 --parallel=1 --use-highlights
real	12m53.936s
user	12m31.779s
sys	0m30.869s

$ time perl6 htmlify.p6 --parallel=1
real	5m20.700s
user	4m38.733s
sys	0m8.739s

foo.diff

$ git diff
diff --git a/highlights/highlight-filename-from-stdin.coffee b/highlights/highlight-filename-from-stdin.coffee
index 908b481..255d7e3 100755
--- a/highlights/highlight-filename-from-stdin.coffee
+++ b/highlights/highlight-filename-from-stdin.coffee
@@ -15,7 +15,6 @@ stdin.on 'data', (input) ->
     name = input.trim()
     process.exit() if name == 'exit'
     file_to_hl = path.resolve(name)
-    process.stderr.write('HL')
     foo = ->
       fs.readFileSync file_to_hl, 'utf8'