Metaplay SDK Release 33 – scheduled experiments and faster startup

Metaplay SDK Release 33 shipped on June 18, 2025. The release adds scheduling to LiveOps experiments and kicks off a multi-release effort to replace runtime reflection with compile-time source generators, cutting SDK initialization time.

Scheduled experiments in the LiveOps Dashboard

The experiment configuration modal has been redesigned, and experiments now support scheduling. Instead of starting and stopping an experiment by hand, you configure its start and end times directly in the dashboard.

Experiment scheduling in the LiveOps Dashboard.

Faster SDK initialization with Roslyn source generators

SDK initialization has historically relied on runtime reflection to discover game-specific Models, Actions, Activables, LiveOps Events, and GameConfig build pipeline integrations by scanning assemblies at startup – a slow process that cannot resolve types statically at build time. Release 33 introduces Roslyn incremental source generators – a .NET compiler feature that generates code at build time – implemented in Metaplay.CodeAnalyzers.Shared, which run at compile time in both Unity Editor and standalone dotnet builds to generate per-assembly integration information directly into the compiled assembly.

This is the first step toward replacing all init-time reflection – including binary serialization code generation – with source generators, work that continues over the next several SDK releases.

Full Release 33 notes cover every change and the migration guide.