what if we use thread ?

pipeline/compilers/__init__.py

 from __future__ import unicode_literals
 
+import multiprocessing
 import os
 import subprocess
 
+from multiprocessing.pool import ThreadPool
+
 from django.contrib.staticfiles import finders
 from django.core.files.base import ContentFile
 from django.utils.encoding import smart_str, smart_bytes
@@ -17,19 +20,27 @@ class Compiler(object):
     def __init__(self, storage=default_storage, verbose=False):
         self.storage = storage
         self.verbose = verbose
+        self.pool = ThreadPool(processes=multiprocessing.cpu_count())
 
     @property
     def compilers(self):
         return [to_class(compiler) for compiler in settings.PIPELINE_COMPILERS]
 
     def compile(self, paths, force=False):
+        def _compile(args):
+            try:
+                compiler = args[0]
+                compiler.compile_file(*args[1:])
+            except CompilerError:
+                if not self.storage.exists(output_path) or settings.DEBUG:
+                    raise
+        files = []
         for index, input_path in enumerate(paths):
             for compiler in self.compilers:
                 compiler = compiler(verbose=self.verbose, storage=self.storage)
                 if compiler.match_file(input_path):
                     output_path = self.output_path(input_path, compiler.output_extension)
                     paths[index] = output_path
-                    try:
                     infile = finders.find(input_path)
                     outfile = finders.find(output_path)
                     if outfile is None:
@@ -37,10 +48,8 @@ class Compiler(object):
                         outdated = True
                     else:
                         outdated = self.is_outdated(input_path, output_path)
-                        compiler.compile_file(infile, outfile, outdated=outdated, force=force)
-                    except CompilerError:
-                        if not self.storage.exists(output_path) or settings.DEBUG:
-                            raise
+                    files.append((compiler, infile, outfile, outdated, force))
+        self.pool.map(_compile, files)
         return paths
 
     def output_path(self, path, extension):