···7788## experimental.fsModuleCache <Version type="experimental">4.0.11</Version> {#experimental-fsmodulecache}
991010+::: tip FEEDBACK
1111+Please, leave feedback regarding this feature in a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions/9221).
1212+:::
1313+1014- **Type:** `boolean`
1115- **Default:** `false`
1216···103107104108## experimental.openTelemetry <Version type="experimental">4.0.11</Version> {#experimental-opentelemetry}
105109110110+::: tip FEEDBACK
111111+Please, leave feedback regarding this feature in a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions/9222).
112112+:::
113113+106114- **Type:**
107115108116```ts
···167175:::
168176169177## experimental.printImportBreakdown <Version type="experimental">4.0.15</Version> {#experimental-printimportbreakdown}
178178+179179+::: tip FEEDBACK
180180+Please, leave feedback regarding this feature in a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions/9224).
181181+:::
170182171183- **Type:** `boolean`
172184- **Default:** `false`
+4-2
docs/guide/open-telemetry.md
···11# Open Telemetry Support <Experimental /> {#open-telemetry-support}
2233+::: tip FEEDBACK
44+Please, leave feedback regarding this feature in a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions/9222).
55+:::
66+37::: tip Example Project
44-58[GitHub](https://github.com/vitest-dev/vitest/tree/main/examples/opentelemetry)
66-79:::
810911[OpenTelemetry](https://opentelemetry.io/) traces can be a useful tool to debug the performance and behavior of your application inside tests.
+4
docs/guide/ui.md
···129129130130### Import Breakdown
131131132132+::: tip FEEDBACK
133133+Please, leave feedback regarding this feature in a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions/9224).
134134+:::
135135+132136The Module Graph tab also provides an Import Breakdown with a list of modules that take the longest time to load (top 10 by default, but you can press "Show more" to load 10 more), sorted by Total Time.
133137134138<img alt="Import breakdown with a list of top 10 modules that take the longest time to load" img-light src="/ui/light-import-breakdown.png">