v2.10.1
krahets/hello-algov2.10.1Sep 15, 2026by rekhoff
Upgrading?
AI Summary
This release focuses on bug fixes for the SpacetimeDB CLI and significant performance improvements for the C# SDK, including concurrent execution of scheduled functions.
Key Highlights
- CLI commands (list, rename, mcp) now respect the project's configured server.
- Scheduled functions now execute concurrently to prevent head-of-line blocking.
- C# SDK performance boosted using direct loops, array pooling, and smaller buffers.
- Documentation updates and broken link fixes in the C# SDK.
New Features
- Concurrent execution for scheduled functions via `handle_queued`.
- Performance optimizations in `SpacetimeDBClient`, `WebSocket`, and decompression.
Full Release Notes
## Bug Fixes ### CLI commands now respect the project's configured server `spacetime list`, `spacetime rename`, and `spacetime mcp` now read the `server` value from `spacetime.json` instead of falling back to the CLI's global default. This makes authentication and target server selection consistent with `spacetime call`, `spacetime logs`, `spacetime sql`, and other database-addressing commands. ([#5883](<https://github.com/clockworklabs/SpacetimeDB/pull/5883>)) ### Scheduled functions no longer block behind slow calls The scheduler previously awaited each scheduled function to completion before dispatching the next one, causing head-of-line blocking and delaying scheduled reducers behind slow procedures. `handle_queued` now submits scheduled calls to the executor concurrently, bounded at the `ModuleHost` level like normal reducers. Already-expired scheduled functions are no longer guaranteed to run in strict `scheduled_at` order, but timestamps observed inside reducers remain monotonic. ([#5736](<https://github.com/clockworklabs/SpacetimeDB/pull/5736>)) ## Performance ### C# SDK performance boost The C# SDK now uses direct loops in place of some LINQ, pools arrays, uses smaller initial WebSocket buffers, and avoids several `.ToArray()` calls. The biggest improvements are in brotli-decompressed transaction updates and reducer/procedure payloads, with fewer allocations across `SpacetimeDBClient`, `WebSocket`, `BSATNHelpers`, and decompression. ([#5840](<https://github.com/clockworklabs/SpacetimeDB/pull/5840>)) ## What's Changed - Make `spacetime list`, `rename` and `mcp` respect the project's server in [#5883](<https://github.com/clockworklabs/SpacetimeDB/pull/5883>) - Scheduled functions: Concurrent execution by not `await`ing on current run. in [#5736](<https://github.com/clockworklabs/SpacetimeDB/pull/5736>) - SDK Performance Boost in [#5840](<https://github.com/clockworklabs/SpacetimeDB/pull/5840>) - docs: update automatic migration compatibility notes in [#5723](<https://github.com/clockworklabs/SpacetimeDB/pull/5723>) - Fix broken links in C# SDK README in [#5888](<https://github.com/clockworklabs/SpacetimeDB/pull/5888>) **Full Changelog**: [v2.10.0...v2.10.1](<https://github.com/clockworklabs/SpacetimeDB/compare/v2.10.0...release/candidate/v2.10.1>)
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