SpaceObServer calculates most of the information to export out of the saved data of the database. Some of the information is not stored in the database, but queried from the file system 'as needed'. This could cause slow exports. Some of the information is not cached in the database, but has to be calculated using SQL statements which could be quite complex and costly. These columns are listed in the section 'Available Columns'. To improve the speed of your export you should exclude the information which are not necessarily needed.
Yes. The results of the file search are displayed directly in the directory tree in SpaceObServer. By default, the details list displays only those files that are directly located in the selected directory. However, you can check the 'Show details flat' option on the 'Details' tab to display all files at any depth in the 'Details'. This gives you a complete list of results for an enabled file search.
Yes. SpaceObServer indicates duplicate files depending on configurable criteria (including MD5 checksums). These files are shown in the "Duplicate Files" tab, which also enables you to remove no longer required copies of this files. The detection criteria can be configured in the Options.
No. Empty directories do not occupy disk space on NTFS volumes, so searching for empty directories costs time, but does not free up disk space. Furthermore, there are directories in which programs place (temporary) files only while they run. Deleting these directories can cause error messages or malfunctions when starting those programs the next time.