Hi, this is a space-time tradeoff and I would like to suggest to make a test by how much the performance is degraded by this before committing. The sheet data will be zipped on creation and then unzipped before injection and then zipped again in the final document. I go along with the argument that people don't have gigabytes of heap space but that the temp file system is too small to hold the data, is in my eyes a specific request and shouldn't be treated as the general case. Unless the tests show that the performance penalty is negligible I propose to make the compression optional. Regards, Alex
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