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  Learn more
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  - Application development
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  - Career growth
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  - GitHub
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  - GitHub Education
    Learn how to move into your first professional role.
  - Programming languages & frameworks
    Stay current on what’s new (or new again).
- Get started with GitHub documentation
  Learn how to start building, shipping, and maintaining software with GitHub.
  Learn more
Engineering
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  Get an inside look at how we’re building the home for all developers.
  - Architecture & optimization
    Discover how we deliver a performant and highly available experience across the GitHub platform.
  - Engineering principles
    Explore best practices for building software at scale with a majority remote team.
  - Infrastructure
    Get a glimpse at the technology underlying the world’s leading AI-powered developer platform.
  - Platform security
    Learn how we build security into everything we do across the developer lifecycle.
  - User experience
    Find out what goes into making GitHub the home for all developers.
- How we use GitHub to be more productive, collaborative, and secure
  Our engineering and security teams do some incredible work. Let’s take a look at how we use GitHub to be more productive, build collaboratively, and shift security left.
  Learn more
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  - Automation
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  - CI/CD
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  - DevOps
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  - DevSecOps
    How to integrate security into the SDLC.
  - Governance & compliance
    Ensuring your builds stay clean.
- GitHub recognized as a Leader in the Gartner® Magic Quadrant™ for AI Code Assistants
  Learn why Gartner positioned GitHub as a Leader for the second year in a row.
  Learn more
News & insights
- News & insights
  Keep up with what’s new and notable from inside GitHub.
  - Company news
    An inside look at news and product updates from GitHub.
  - Product
    The latest on GitHub’s platform, products, and tools.
  - Octoverse
    Insights into the state of open source on GitHub.
  - Policy
    The latest policy and regulatory changes in software.
  - Research
    Data-driven insights around the developer ecosystem.
  - The library
    Older news and updates from GitHub.
- Unlocking the power of unstructured data with RAG
  Learn how to use retrieval-augmented generation (RAG) to capture more insights.
  Learn more
Open Source
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  Everything open source on GitHub.
  - Git
    The latest Git updates.
  - Maintainers
    Spotlighting open source maintainers.
  - Social impact
    How open source is driving positive change.
  - Gaming
    Explore open source games on GitHub.
- An introduction to innersource
  Organizations worldwide are incorporating open source methodologies into the way they build and ship their own software.
  Learn more
Security
- Security
  Stay up to date on everything security.
  - Application security
    Application security, explained.
  - Supply chain security
    Demystifying supply chain security.
  - Vulnerability research
    Updates from the GitHub Security Lab.
  - Web application security
    Helpful tips on securing web applications.
- The enterprise guide to AI-powered DevSecOps
  Learn about core challenges in DevSecOps, and how you can start addressing them with AI and automation.
  Learn more

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Home / Engineering / Architecture & optimization / Page 3

Architecture & optimization

The GitHub Ruby on Rails monolith is big: nearly two million lines of code and more than 1,000 engineers collaborating on it, to the tune of around 20 deployments every day. Follow along to see how we build and continually improve the tools you use every day.

An illustration of two octocats repairing a robot.

Architecture & optimization

How we made diff pages three times faster

We serve a lot of diffs here at GitHub. Because it is computationally expensive to generate and display a diff, we’ve traditionally had to apply some very conservative limits on…

An illustration of two octocats repairing a robot.

Architecture & optimization

Introducing DGit

Edit: DGit is now called Spokes GitHub hosts over 35 million repositories and over 30 million Gists on hundreds of servers. Over the past year, we’ve built DGit, a new…

An illustration of two octocats repairing a robot.

Architecture & optimization

Delivering Octicons with SVG

GitHub.com no longer delivers its icons via icon font. Instead, we’ve replaced all the Octicons throughout our codebase with SVG alternatives. While the changes are mostly under-the-hood, you’ll immediately feel…

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