### Core Changes

- Tracker communication uses fewer resources
- More accurate bandwidth limits
- Reduce disk fragmentation by preallocating files
- Stability, security, and performance improvements to the RPC/Web UI server
- Support compression when serving Web UI and RPC responses
- Simplify the RPC whitelist
- Fix bug that prevented handshakes with encrypted BitComet peers
- Fix 1.3x bug that could re-download some data unnecessarily
- Lazy bitfields

### Mac-specific Changes

- Option to automatically update the blocklist weekly
- In the file inspector tab, show progress and size for folders
- Scrollbars correctly appear when the main window auto-resizes
- Sparkle updated to 1.5b6

### Web Client Changes

- The Web Client is now out of beta
- Minor display fixes
- On iPhone/iPod touch, launching from the home screen hides the address bar

For a full list of changes, click here.

### Note

Transmission requires at least Mac OS X 10.4.11 with Security Update 2008-002. Mac OS X 10.5 or greater is highly recommended.