> ## Documentation Index
> Fetch the complete documentation index at: https://docs.darvas.app/llms.txt
> Use this file to discover all available pages before exploring further.

# API limits

> All runtime budgets: plots, hlines, fills, Series, entities, bar lookback, and timing constraints.

## Runtime budgets

| Resource           | Limit            | Error raised      |
| ------------------ | ---------------- | ----------------- |
| Source script size | 50 KB            | `INVALID_REQUEST` |
| Heap memory        | 64 MB            | `HEAP_LIMIT`      |
| Stack depth        | 1 MB             | `RUNTIME_ERROR`   |
| Top-level eval     | 1.5 s wall-clock | `TIMEOUT`         |
| Per-bar `onBar`    | 50 ms wall-clock | `TIMEOUT`         |
| Total run time     | 10 s wall-clock  | `TIMEOUT`         |
| Bar lookback       | 100 000 bars     | `INVALID_REQUEST` |

## Drawing primitive budgets

| Primitive            | Limit             | Overflow behavior                  |
| -------------------- | ----------------- | ---------------------------------- |
| `plot()` series      | 64                | Error at evaluation time           |
| `hline()`            | 64                | Error at evaluation time           |
| `fill()`             | 64                | Error at evaluation time           |
| `bgcolor()` entries  | 1 000 most recent | Silent truncation (oldest dropped) |
| `barcolor()` entries | 1 000 most recent | Silent truncation (oldest dropped) |

## Entity budgets

| Entity type               | Per-type limit | Overflow behavior                        |
| ------------------------- | -------------- | ---------------------------------------- |
| Line                      | 500            | Warning in console; oldest truncated     |
| Box                       | 500            | Warning in console; oldest truncated     |
| Label                     | 500            | Warning in console; oldest truncated     |
| Marker                    | 500            | Warning in console; oldest truncated     |
| LineFill                  | 500            | Warning in console; oldest truncated     |
| **All entities combined** | **1 500**      | Global cap enforced after per-type check |

<Warning>
  Entity overflow is silent on screen - no chart error. Watch the Console panel for `"Line limit exceeded"` and similar warnings when you hit the per-type cap.
</Warning>

## Series budget

| Resource             | Limit    | Notes                                                   |
| -------------------- | -------- | ------------------------------------------------------- |
| `Series()` instances | 64 total | Shared with `ta.barssince` and `ta.cum` internal series |

Every unique key passed to `ta.barssince(key, ...)` or `ta.cum(key, ...)` consumes one slot from this budget.

## Console output budget

| Resource            | Limit              |
| ------------------- | ------------------ |
| Console log lines   | 100 per evaluation |
| Characters per line | 200                |

Lines beyond the cap are dropped. The console panel shows a truncation notice when the limit is reached.

## Banned constructs

The following are rejected at parse time (not at runtime - the script will not evaluate at all):

* `Function`, `eval`, `globalThis`, `window`, `self`
* `WebAssembly`, `Atomics`, `SharedArrayBuffer`
* `Reflect`, `Proxy`
* `setTimeout`, `setInterval`, `setImmediate`, `queueMicrotask`
* `fetch`, `XMLHttpRequest`, `WebSocket`, `Worker`
* `process`, `require`, `__dirname`, `__filename`
* `import` declarations and dynamic `import()`
* `with` statements
* `async function` / `async () =>`
* Generators
* `for await ... of`
* `while(true)` without a syntactic `break`
* `for(;;)` without a `break`
* Literal loop bounds > 100 000
* Property walks through `__proto__` / `constructor` / `prototype`

## Related pages

<CardGroup cols={2}>
  <Card title="Performance tips" href="/reference/performance">
    How to stay within budgets on large bar counts.
  </Card>

  <Card title="Troubleshooting" href="/reference/troubleshooting">
    Common limit-related error messages.
  </Card>

  <Card title="Series" href="/essentials/series">
    64-series budget details.
  </Card>
</CardGroup>