Rust 1.0–1.5 as of 2015

Currently issuing regular releases every six weeks with a train-based release model. Some highlights for Rust 1.0 to 1.5:

• 1.0 (May, 2015): 1.0 release of Rust. Introduced cargo and crates.io six months ago
• 1.1 (June, 2015): 32% improvement in compilation time over 1.0
• 1.2 (Aug, 2015): Enabled parallel codegen, resulting in 33% speedup in compilation time on a 4-core machine
• 1.3 (Sep, 2015): Efficient substring matching algorithm, efficient zero filling, efficienct PartialEq