If you are editing a large mind map, perhaps you will find MindV reaction would be a little slow. As if all of the topics are expanded, updates would be slow. The trick here is that only expand the branch being edited, while the other branches are collapsed. There are few topics are visible, MindV's reaction will be very fast.
Here is a expand big map:
Here is a collapsed mind map, only one branch of topic is expanded.
Download MindV help files from download.com:
http://www.mindv2.com/ (Simplified chinese)
http://tw.mindv.com/ (Traditional chinese)
http://mindv2.cloudapp.net/ (MindV online mind mapping service)
http://hi.baidu.com/mindvsales/blog (Hanson's simplified chinese blogs)
http://cn.linkedin.com/pub/hanson-chen/28/464/89a (Hanson's linkedin home page)