Poor Performance of saving documents with a bigger attachment

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Add attachments which total size is bigger for example 60 mb.
2. Try to save File.
3.

What is the expected output? What do you see instead?
The application doesn't respond.(Maybe you could consider adding some
progress bar for saving) And it takes a lot of time to save file.

What version of the product are you using? On what operating system?
Xmind Version: 3.0.2; Windows Vista SP1; Core Duo T2400 1,8 Ghz, 2,5 Gb ram.

Please provide any additional information below.
Possibility for adding a lot of attachments is crucial for me. I have a lot
document's which I'm working with. And I have to easily distribute it. (one
*.xmind file with all documents). There is also no option for adding
relative path in "hyperlink" menu for files which are in the same folder as
*.xmind file. Changing name or direction of folder makes links unusable. 

regards
Tom.

Original issue reported on code.google.com by roba...@gmail.com on 2 Jul 2009 at 10:57