Major 1. Open "_common_data\clustal\10000_sequences.nwk".
2. Zoom in and zoom out the tree view.
Actual: these operations take time for calculations.
3. Open the options panel.
4. Change the tree layout: Circular.
Actual: it is not possible wait while the layout is changed.
Improvement: it not a big deal to paint 10 thousand points, so the tree view must be improved for showing such big trees.
