This is a good idea and will help improve rendering speed, but it has a small issue. Now, the shadows that are casted by move suggestions are cast on top of existing suggestions. You should probably do two passes: one to draw all the shadows, and one to draw all of the suggestions. It will make them look better.

You can see this if you have two suggestions that are next to each other. One will cast a shadow on top of the other.

This is a good idea and will help improve rendering speed, but it has a small issue. Now, the shadows that are casted by move suggestions are cast on top of existing suggestions. You should probably do two passes: one to draw all the shadows, and one to draw all of the suggestions. It will make them look better.

You can see this if you have two suggestions that are next to each other. One will cast a shadow on top of the other.

Yes,there is a shadow on top of the other, and i separate drawLeelazSuggestionsBackground into two parts shadow and circle.Now it seems the same effects as before.