OK, it works now, not sure why just now the value can not be changed to larger than 1,000,000.

The replace speed is better than before version. Have you noticed the Undo slower than the before version?

In my case, it takes almost 15 secs to finish the Undo action. In before version I think it only need one sec. However the Undo action is not a common function for large file than search.

Thanks a lot for your support. Wish it can be more faster and powerful. :-)