Teaser was replaced by view mode a long time ago, but was left in for some reason.
Author name, author attributes and date should depend on display_submitted but are generated even if that's not set, that's a very small performance issue.
Author picture already depends on display_submitted but this isn't documented in the template.
Also removed some other stale documentation relating to variables that are long gone like readmore.
FAILED: [[SimpleTest]]: [PHP 5.5 MySQL] 113,584 pass(es), 10 fail(s), and 0 exception(s). View
FAILED: [[SimpleTest]]: [PHP 5.5 MySQL] 103,179 pass(es), 11 fail(s), and 0 exception(s). View
FAILED: [[SimpleTest]]: [PHP 5.4 MySQL] 95,397 pass(es), 4 fail(s), and 0 exception(s). View