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If you open a document that exceeds the limit configured in Open preferences (the default limit is 30 MB), a dialog box will be displayed prompting you to choose whether you want to optimize the loading of the document for large files or for huge files. If you choose the Optimize loading for large files option (typically recommended for files smaller than 300 MB), a special memory optimization is implemented so that the total memory allocated for the application is not exceeded. A temporary buffer file is created on disk and the available free disk space needs to be at least double the size of the file you want to open.

When opening a large file in this optimized editing environment, some editing features are disabled, including: