Fast access checks

Remove locks

Database replication

Disabled aggregator feed blocks (for massive feed aggregation)

Disabled anonymous contact form

External page cache

Fast path alias detection

First path argument whitelist

Separated user access timestamps

Native JSON encoding

Removal of LOWER() for user-lookup queries

Reverse proxy support

Separate aggregator cron (for massive feed aggregation)

Separate node and user search

Integrated SimpleTest for unit testing

Write-through caching of variable deletion

Write-through caching of all variable operations

Tracker 2

Materialized View API

Distributed menu tree generation and caching

Multi-layer proxy support

Lazy session creation

Path caching