Django ORM performance patch
I made a patch for Django to add QuerySet.fields(*fields, **related_fields) and make possible to load only some from master and related models fields. It allows to tune various object list queries when we need only limited subset of all fields, improve general performance and decrease database load. As side effect of this patch support of selecting fields from related models in QuerySet.values() is implemented too. It was changed signature of this method from values(*fields) to values(*fields, **related_fields) but the change is backward compatible.
Django profiler
django-profile.py allows to analyze any django projects, i.e. to find number of SQL queries used on each page and print common SQL-usage report.
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