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New Post: PHP Excel exponentially slow on large exports

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There's a wealth of advice here on the forum for improving speed, such as setting styles across ranges rather than for each individual cell, and using the fromArray() method for setting several style features in one go, to setting preCalculateFormulas FALSE in the Writer. The current github develop branch isn't yet stable enough for a 1.7.9 release, but there have been a number of speed improvements already implemented there, and I should be doing a new release sometime toward the end of February with all those changes.


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