"Challenges developers face with Rust build performance were not always as simple as slow compiler performance, said Beranek. "There are many diverse workflows with competing trade-offs, and optimizing build performance for them might require completely different solutions," he said. "Some approaches for improving build performance can also be quite unintuitive. For example, stabilizing certain language features could help remove the need for certain build scripts or proc macros, and thus speed up compilation across the Rust ecosystem.""
"Waiting too long for an incremental rebuild after making a small source code change was by far the most common complaint in open answers received. The incremental build of a single Rust compilation crate was too slow. Several users mentioned that they would like to see Rust perform hot patching. When Rust developers experience slow builds, it can be challenging to identify where exactly the compilation process is spending time, and what the bottleneck could be."
Rust build performance problems arise from diverse workflows and competing trade-offs rather than solely slow compiler execution. Stabilizing specific language features can remove the need for build scripts or procedural macros and thereby speed compilation. Common complaints include long waits for incremental rebuilds after small changes, slow incremental builds for individual crates, and desires for hot patching. Identifying precise compilation bottlenecks remains difficult when builds are slow. The compiler continues to improve annually, but many developers require substantial performance gains. Long-standing initiatives aimed at stabilizing features are targeted to deliver significant build-performance improvements.
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