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Recomputing packfile deltas and synchronizing hundreds of decentralized internal Git mirrors saturated CPU and RAM across their fleet.</li>\n</ul>\n\n<h1>How "Scion" Replaces Git</h1>\n\n<p>Built in 5 months by a 7-person engineering team, Scion ditches Git's offline packfile model for a centralized, virtualized architecture (conceptually similar to Google's Piper/CitC or Meta's Sapling/EdenFS):</p>\n\n<ol>\n<li><strong>Lock-Free Changesets on Cloud Spanner:</strong> Repository state and changesets are stored in an always-online, lock-free model backed by <strong>Google Cloud Spanner</strong> for strong global consistency without mirror sync lag.</li>\n<li><strong>Tiered RPC & Lazy Hydration (</strong><code>scion-cache</code> <strong>+</strong> <code>scion-daemon</code><strong>):</strong> Regional <code>scion-cache</code> read replicas sit in front of Spanner, paired with a local <code>scion-daemon</code> virtual filesystem on developer machines and CI runners. Instead of pulling 25 GB working copies, files are hydrated lazily on demand.</li>\n<li><strong>The Impact:</strong> CI checkout times dropped from <strong>minutes to seconds</strong>, and server CPU/memory footprint dropped by <strong>200x</strong>.</li>\n<li><strong>Ingestion Pipeline Optimization:</strong> They also ran an internal snapshot of Claude Mythos Preview against Scion's ingestion pipeline, refactoring it to use <strong>20x less RAM</strong> and run <strong>4x faster</strong>.</li>\n</ol>\n</div><!-- SC_ON 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