What changed in Blender in 2015

Significant improvements in viewport performance.

Introduced text effect strips in the sequencer, supporting subtitle export.

Enhanced performance in the file browser and added arrow keys navigation support.

Addressed numerous bugs and made various improvements.

Added absolute grid snapping functionality in the 3D view.

Added support for OpenSubdiv geometry subdivision technology.

Introduced a feature to automatically offset nodes for better organization.

Enabled sculpting with tiled strokes for improved workflow.