# Timing > Scale a generated text diff and inspect core algorithm, cleanup, total time, and segment counts. **Source:** [https://diff.svelte.page/examples/timing](https://diff.svelte.page/examples/timing) **Markdown mirror:** [https://diff.svelte.page/examples/timing.md](https://diff.svelte.page/examples/timing.md) --- This mirror preserves the prose, implementation notes, and runnable Svelte source behind the live example page. ## FIG-001: processing timing. The `onProcessing` callback reports core diff time, cleanup time, total time, and final tuples together. Scale the generated documents to profile realistic content. **Metadata:** tag: `PERFORMANCE` | callback: `onProcessing` | unit: `ms` ### Source #### Timing.svelte Source file: [src/lib/examples/timing/demos/Timing.svelte](https://github.com/humanspeak/svelte-diff/blob/main/docs/src/lib/examples/timing/demos/Timing.svelte) ```svelte

lines {size}

main{timing.main.toFixed(3)} ms

cleanup{timing.cleanup.toFixed(3)} ms

total{timing.total.toFixed(3)} ms

segments{segmentCount}

```