XML mapping improvements in 2.5.3

In a current project we're running and sometimes we're having difficulties with importing large and deeply nested xmls. We're told that 2.5.3 has improvements regarding to importing xml in mendix. I'm trying to address these changes in the release notes. But I couldn't find one. Could someone explain which changes are affecting the xml import?
1 answers

There are some improvements, but they're mostly bugfixes. The one performance improvement that we did add (undocumented, unfortunately) was with the use of convert-by-microflows for attributes. These are no longer run in a separate transaction, which will improve the speed for very large xml imports.