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One major limitation of malloc (and even the best implementations like jemalloc and dlmalloc) is that they try to use a single allocator for each data structure. This is a mistake: A huge performance gain can be had by using
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Implementations have found ways to optimize transform pipelines by collapsing identity transforms, short-circuiting non-observable paths, deferring buffer allocation, or falling back to native code that does not run JavaScript at all. Deno, Bun, and Cloudflare Workers have all successfully implemented "native path" optimizations that can help eliminate much of the overhead, and Vercel's recent fast-webstreams research is working on similar optimizations for Node.js. But the optimizations themselves add significant complexity and still can't fully escape the inherently push-oriented model that TransformStream uses.
The deployment collapses to a single Postgres instance where pg_dump backs up forge metadata, git objects, and user data together, and replicas handle read scaling for the web UI without NFS mounts or a Gitaly-style RPC layer. The path there is a Forgejo fork replacing modules/git with a package that queries Postgres, where Repository holds a database connection and repo_id instead of a filesystem path and Commit, Tree, Blob become thin wrappers around query results.