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If you use thousands of detail blocks in the same area, you will notice significant performance drops. This is because all those details have to be rendered by your graphics card. To alleviate this, use detail blocks of lower resolutions and use normal blocks where ever you can.

Super Build

Pressing F8 will open the Super Build panel on the right side of your screen

This allows you to quickly build simple geometric shapes using any block you have selected. To use the Super Build, first select a shape to build using F9. With F10 you can select if it should build a solid or hollow shape. With F11 you toggle the build mode. Instant will get you the fastest result, but can result in some holes for very large shapes. End toggles between the anchor of the shape being centered or on the bottom middle of the shape.

X, Y and Z allow you to change the size of the shape. Pressing them increases that dimension by 1. Hold shift and press X, Y or Z to decrease by one. You can additionally hold ALT to change the size by 16 at a time.

Copy Paste

The Copy Paste tool allows you to quickly copy part of a design you've made, rotate or flip it around, and paste it back into the world in whatever place you want. Open the copy paste panel by pressing F11.
The Copy Paste panel is currently UNDER CONSTRUCTION, which is why it doesn't look like the rest of the interface.

Copy Paste Controls

Press Ins to place the first corner of the rectangular part you want to copy.

Press Del to place the second corner of the rectangular part you want to copy. The area to be copied will now be highlighted.