I have just migrated the user home page of mixin.com (http://www.mixin.com/users/ndengler/) from django to jinja2 on our test environment. The time used for rendering the template shrunk from ~1000ms to ~400ms (which is still to much). It's more than 2 times faster and we are planning to migrate our complete application on jinja2. I wish I knew jinja2 before!