is the most efficiency-focused of the three DLCs, and the one power users tend to notice the fastest. Unlike cosmetic add-ons, it solves a practical question: whether the default capability is enough to support higher-frequency, more complex workflows.

Why this is the first DLC I usually recommend

Both the free version and the main Steam release include a default proposal concurrency limit of 3. Proposals in generating, executing, and archiving states all count toward that shared limit.
The core upgrade in Turbo Engine DLC is expanding that limit from 3 to 32, so you can keep multiple proposals moving in heavier parallel workflows. This is not just a nice-looking number on paper. It directly affects whether you can smoothly push multiple requirements, implementation directions, and organization tasks at the same time.
If you have already moved from "trying HagiCode once in a while" to "using it every day for real work," Turbo Engine DLC is usually the one worth buying first.

Core upgrades

If what you care about most is "what exactly is already available right now," think of it as these shipped capabilities:

• Proposal concurrency increases from 3 to 32. This is still the most important and most immediately noticeable upgrade in Turbo Engine DLC. Generating, executing, and archiving proposals all share the same concurrency pool, so the higher ceiling directly changes whether you can keep several task lines moving in parallel.
  
• Extended document themes. This is not just a generic wording toggle. In adventure party management related screens, you can switch to extended Document Themes and preview terminology and copy across the workspace, history area, and fallback grouping in real time.
  
• Custom
  Co-Authored-By
  in AI Compose Commit. In Git settings, you can save a default
  Co-Authored-By
  mode. In a single AI Compose run, you can also temporarily switch to a custom collaborator name and email, or omit that trailer entirely for that run.
  
• Brand customization. After Turbo Engine DLC is enabled, you can upload a header logo, set the application title, browser title, and the brand click-through link. In other words, it does not just replace a small icon in the corner. It opens up the entire workspace header brand area for customization.
  
• Custom avatar upload and shared reuse. This is not only about changing the picture for the current Hero. You can now upload a custom avatar for the current Hero and reuse avatars from the shared custom avatar library in create, edit, and bulk creation flows.
  
• Official DLC avatar resources wired into the runtime gallery. Turbo Engine DLC avatar resources appear inside Hero Avatar Gallery and bulk creation flows, so they are not just promotional assets shown on a store page. They are already connected to real workflows as usable avatar assets.

In other words, Turbo Engine DLC now covers a full upgrade chain of higher concurrency + stronger Git workflow + deeper personalization, not just a bigger concurrency number.

Who should buy it

• Users who regularly push multiple proposals, implementation branches, or documentation tasks at the same time.
  
• Heavy users who need a higher limit than the default 3 concurrent proposals.
  
• Users who want extended document themes, Git
  Co-Authored-By
  customization, avatar expansion, custom avatar upload, and brand customization in the Steam workspace.

If you already clearly feel that 3 concurrent proposals are not enough, or you want stronger control over how the interface presents your workspace, this DLC is basically a must-have upgrade rather than an optional cosmetic extra.