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page_id: wsd-openroad-gui-timing-corner-selection-79fd91a6
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title: "Thread: Openroad GUI timing corner selection"
slug: wsd-openroad-gui-timing-corner-selection-79fd91a6
route: /evidence/i-information/questions/threads/openroad-gui-timing-corner-selection
section: reference
access: public
summary: 3 Discord messages from ℹ️ - Information/⁉️-questions/threads/openroad-gui-timing-corner-selection.md.
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---

# Thread: Openroad GUI timing corner selection

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1445349564071542794`

Messages: **3**

## message-1445349564071542794

**2025-12-02T09:43:09.371+00:00 — Greg (@greg.hashtag.9468)**

- Message ID: `1445349564071542794`
- Author ID: `274535015969456128`
- Nickname: Greg
- User name: greg.hashtag.9468
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445349564071542794/1445349564071542794
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json

**Content**

```text
I've tried googling this, but not having much luck yet. When opening the openroad-gui via librelane 'nom_tt_25C_5v00' timing corners are loaded and reported. I'm seeing a large gap between the slowest:'max_ss_125C_4v50' and fastest: 'min_ff_n40C_5v50' corners. Curious how I would load the other timing corners to visually see the paths, and maybe optimise macro placements.

I've tried `read_spef --corner <file>`, but the corner names don't seem to be correct.
```

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## message-1445356348224307230

**2025-12-02T10:10:06.839+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445356348224307230`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445349564071542794/1445356348224307230
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json

**Content**

```text
Quick and dirty: add e.g. `DEFAULT_CORNER: nom_ss_125C_4v50` to your config and LibeLane will load this corner instead.
```

**Reactions**

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---

## message-1445356464352006144

**2025-12-02T10:10:34.526+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445356464352006144`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445349564071542794/1445356464352006144
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/openroad-gui-timing-corner-selection/2025-12/2025-12.json

**Content**

```text
However, LibreLane should really load all timing corners that are available.
```

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