et al.  Can you say 'registry'?  Drupal now maintains an internal registry of
  all functions or classes in the system, allowing it to lazy-load code files as
  needed (reducing the amount of code that must be parsed on each request). The
  list of included files is cached per menu callback for subsequent loading by
  the menu router. This way, a given page request will have all the code it needs
  but little else, minimizing time spent parsing unneeded code.

  et al.  Can you say 'registry'?  Drupal now maintains an internal registry of
  all functions or classes in the system, allowing it to lazy-load code files as
  needed (reducing the amount of code that must be parsed on each request). The
  list of included files is cached per menu callback for subsequent loading by
  the menu router. This way, a given page request will have all the code it needs
  but little else, minimizing time spent parsing unneeded code.

- Patch #251473 by webchick, chx, et al: one step closer to running tests in the includes directory.  Not working yet.

- Modified patch #230374 by killes, jakeg, Eaton et al: corrected problem with form API caches not being flushed.  This could lead to performance issues.

- Patch #252920 by flobruit and pwoladin: split profile module tests in smaller tests, and improved performance of tests.

- Patch #252920 by flobruit: fixed broken profile module tests by rewriten them -- and added some more tests.

- Patch #217957 by Pasqualle, yched and quicksketch: tabledrag column hiding not taking headers colspan into account + performance improvements.

- Patch #240988 by David_Rothstein: fixed left-over documentation after the HTML escaping became a filter of its own.

- Patch #252365 by boombatower: clean up the temporary directory that gets creating during the test runs.

- Patch #246298 by boombatower: added missing <label> to module names on uninstall page.  Improves consistency with the module install page.

- Patch #231132 by snufkin: fixed invalid XML-RPC error messages due to HTML tags being inserted in the message string.

- Patch #251631 by chx: fixed behavior of the Drupal web test case with regard to POST and GET operations.

- Patch #250056 by dmitrig01: if all the checkboxes in a checkbox group are checked on page load, the check all box isn't checked, which is should be (because all sub-boxes are checked).

- Patch #249629 by chx, flobruit: made drupal_test_case() reusable and improve the SimpleTest documentation.