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I have an OmniOutliner Pro 3 document that I use for an ideas database.

Months ago I duplicated it and tested it with OmniOutliner 4 I gave up on OO4 for a while.

According to the Finder's More Info the file has an Item Count of 14,000.

Last night I gave OO4 another test.

I expanded the entire file to test Memory and CPU usage. It took forever.

Memory usage got up to over 1.6 GB and CPU was constantly around 100%

OmniOutliner Pro 3 handles this file without flinching.

Hope this can be fixed


If this is a file you would be willing to share with us for testing purposes, it would be great if you could email it to us at There are many factors such as structure and styles that could be a factor here and having concrete examples would help immensely with performance fixes. Thanks!
The file contains sensitive info

I exported an updated version of the file to OPML.

Opened it in OO4.

Saved to OO3 format.

Applied a theme

It has 16,580 items.

328 are checked.

Expanded all levels.

When it finished expanding, OO4 was using almost 800 mb of Memory.

If the structure of the file is a potential issue, maybe I could replace the existing content in an OPML export using regular expression.

Think that would help?



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