[svn r51132] a todo/note on skip's and speed (inspired by exarkun on #pypy)

--HG--
branch : trunk

py/doc/TODO.txt

@@ -22,6 +22,10 @@ py.test
 
 - document py.test's conftest.py approach
 
+- review and optimize skip-handling (it can be quite slow in
+  certain situations because e.g. setup/teardown is fully performed 
+  although we have "skip by keyword" and could detect this early)
+
 py.execnet
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