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[Zootsuit]

I use the very helpful custom expression to filter my library for a file existence-nonexistence. (In addressing prior crashes, there was substantial duplication of entries and non-existent files were not filtered out.) https://yabb.jriver.com/interact/index.php/topic,54128.msg368367.html#msg368367

On my audio library screen, the results of this filtering are expressed in a separate column as 0 or 1, respectively. When I attempt to sort by those custom expressions, MC 33 hangs for long periods and ultimately crashes. Is there something in the program that conflicts with that command, or vice-versa? 

Edit 9-26: Found a workaround but still would  like to know why the custom field behaves differently.

[zybex]

When you sort by an expression using IsMissing(), MC has to check each and every listed file on the filesystem. If your files are on a NAS this can mean many thousands of SMB requests which will take some time to complete. Unfortunately MC is not properly threaded and this will block the UI until the task completes.

[Hendrik]

Sorting is probably double bad because it likely reads the expression multiple times. Instead maybe setup a smartlist that only has missing files - still slow, but not quite as much as Sorting by it.