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Process large diagram issue #1028

@lisa-fehr

Description

@lisa-fehr

Bug report issue

Description

Uploading a large bpmn hangs and can use up a lot of memory.

Reproduction steps

Upload the following bpmn: https://www.dropbox.com/s/3pk72nvqo0izkqf/SSC%20POLAND%20IT%20and%20IS%20Resources%20Management.txt?dl=0 (rename extension to xml or bpmn)

Expected behaviour

Upload should not hang

Actual behaviour

Can crash the browser. In a good scenario it takes 7 minutes to load. After loading, alterations to the diagram can still take a long time.

Screen Shot 2020-01-14 at 1 51 38 PM

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bugFunctionality isn't working as expected; usually the result of a mistake or oversight in the code.

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