> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/gpcscripting/gpc-script-guide/data-and-persistence/runtime-variable-budget.md).

# Runtime variable budget

Zen Studio Live permits at most 1,020 runtime variable slots. A scalar uses one; a runtime array uses one per element. Globals, function-call frames, parameters, and expression temporaries ultimately share the VM's 1,024-slot storage ceiling, so a script near the variable limit has almost no safe stack headroom.

```cpp
int mode;          // one slot
int samples[100];  // 100 slots
```

Use const arrays for immutable tables and runtime arrays only when elements must change.


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