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Changelog from the base Pressflow 6. Currently tracking Pressflow and Drupal 6.25-dev.

General

• Move documentation to its own directory. The goal is to provide the ability to deny web browsers from downloading documents and finding the specific version of Drupal we are running.
• Create patches dir for case-specific patches not automatically committed to the tree

Uncommitted Core Bugfixes (committed to this tree but not yet in Drupal core)

• db_set_active errors out if db_connect fails. Add in the ability to handle this gracefully (don't always call _db_error_page)
• Impossible to insert serialized data with update_sql()
• Duplicate entry of themes primary key in systems table of Drupal 6.24
• Call to undefined function locale_inc_callback()
• Race condition in file_delete()
• path_alias_cache only caches first page
• path_alias_cache with query strings, ORDERBY fixes
• Inconsistency between CDN module core patch and Pressflow patch
• node_access_rebuild() does not finish
• MySQL silently fails on large packets
• Ensure that entries are written to watchdog table
• node_view() PHP5 compatibility
• Make lock_wait() wait less
• Remove drupal_set_message() calls from file_check_directory()
• Static caching: when drupal_execute()ing multiple forms with same $form_id in a page request, only the first one is validated
• drupal_http_request and malformed responses
• drupal_write_record can't update a column to NULL

Uncommitted Core Features (committed to this tree, not expected to ever be in Drupal core)

• Support for the Extended Path Aliases module.
• NewRelic: Disable Apdex calculation for the Batch API callback. Users generally don't use Batch API.
• Use filter_var for valid_email_address() checking, in line with Drupal 7 function

Uncommitted Core Performance Enhancements (committed to this tree, not in Drupal or Pressflow core)

• Cache module_implements()
• Optimize element_children()
• _menu_link_translate() might avoid calling _menu_load_objects()
• COUNT(*) is an expensive query in InnoDB
• node_access issues four queries on default install node/1 and has no static cache
• optimize _trigger_get_hook_aids()
• Be more sparing with locale cache clears
• Backport DRUPAL_ROOT to 6.x
• bootstrap_invoke_all() queries bootstrap modules twice
• Backport $conf['blocked_ips'] to D6
• Performance fix in system_region_list() avoid an SQL query by using globals
• Make drupal_attributes() faster
• taxonomy_get_vocabularies needs static caching
• Improve JSON encoding, require PHP 5.3
• missing indices on comment table

Optional Patches (uncommitted to the main tree, but in the patches directory and apply cleanly)

• Taxonomy cache implementation, from advcache. Breaks taxonomy access, but otherwise adds performance. Tested, not working. Currently had some problems on my site with this, it may need to be reworked.
• Blockcache alter core patches. Tested, working. Select whichever patch is right for your environment per the blockcache_alter docs.
• Cache url(). Tested, currently causes extreme lock contention on my site. Not using it.
• Optimize menu_tree_page_data() performance. Not yet tested.
• Improve performance and eliminate duplicates caused by node_access table joins. Not yet tested.
• User and node load caching. Not yet tested.