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diff --git a/why-so-slow.py b/why-so-slow.py
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+#!/usr/bin/python
+
+'''
+Determine which files are contributing the most to the size of a tags file. You
+can specify the location of the tags file as a command line argument. If you
+pass a numeric argument, no more than that many files will be reported.
+
+Author: Peter Odding <peter@peterodding.com>
+Last Change: May 11, 2011
+URL: https://github.com/xolox/vim-easytags/blob/master/why-so-slow.py
+'''
+
+import os, sys
+
+tagsfile = '~/.vimtags'
+topfiles = 10
+
+for arg in sys.argv[1:]:
+  if os.path.isfile(arg):
+    tagsfile = arg
+  else:
+    topfiles = int(arg)
+
+infile = open(os.path.expanduser(tagsfile))
+counters = {}
+
+for line in infile:
+  fields = line.split('\t')
+  filename = fields[1]
+  counters[filename] = counters.get(filename, 0) + len(line)
+infile.close()
+
+sortedfiles = sorted([(s, n) for (n, s) in counters.iteritems()], reverse=True)
+for filesize, filename in sortedfiles[:topfiles]:
+  if filename.startswith(os.environ['HOME']):
+    filename = filename.replace(os.environ['HOME'], '~')
+  print '%i KB - %s' % (filesize / 1024, filename)
+
+# vim: ts=2 sw=2 et