Changelog

In recent weeks, we've gradually rolled out a number of optimizations for Dockerfile-based service builds on Render. These optimizations include:

• Tuning chunk size and parallelism for build image uploads
• Speeding up build scheduling on Render infrastructure
• Parallelizing generated image upload with export to build cache
• Storing build cache in Render's own image registry with automatic pruning

Together, these optimizations have reduced median build time for Docker-based services by 60%:

Before these optimizations (week of March 15), median build time was 87 seconds, consistent with prior weeks. After all optimizations landed, the highest weekly median observed has been 32 seconds (a conservative 60% reduction). Build times remain in this range.