Portal Gun for Teardown.
Left click: Place blue portal
Right click: Place orange portal
E: Pick up / release object
R: Remove portals
This mod has several options, including render settings, since the mod can be intensive on performance.
To change these settings, select the mod in the Mod menu, and click Options. It is located right above the Enabled button.
You can lower the portal resolution and render distance, which will improve performance.