1.23.1

This release loads the tile images of the Build palette only when Build mode shows the palette, and each closed section loads its own images when it opens. A blank campaign now starts with about 3,700 DOM nodes instead of about 41,000, and the browser bench boot takes about 230 ms instead of 470 ms. The bench fight scenario now waits for the Next turn button and advances all twenty turns.

The first switch to Build mode fetches the Terrain images at that moment, so the swatches can appear a moment after the palette does on a slow connection.