I'm sure I'm missing some things....
Sources - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9
- New and improved performance
- Consumes less RAM and CPU cycles
- More granular prioritization of memory
- Improved hardware accleration
- Changes and reductions to services
- Improved power management
- Faster boot time
- Text acceleration
- Improved image rendering
- Improved geometry rendering
- New and improved security
- Integrated anti-malware protection
- Randomizing memory
- Better memory allocation
- Smart screen
- Guard pages
- Safer Wi-Fi
- Secure boot
- Metro apps are sandboxed
- ASLR and exploit mitigations
- New and improved features
- Better task manager
- Native ISO support
- Reset & Refresh
- New chkdsk
- File history
- Storage Spaces & Hyper-V
- Better multiple-monitor support
- Improved copy function and dialog box
- Storage spaces
- Account sync
- Better sharing for social media
- Applocker
Sources - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9