PHPExcel very slow - ways to improve?

Question

I am generating reports in .xlsx using PHPExcel. It was okay in the initial testing stages with small data sets (tens of rows, 3 sheets), but now when using it on a real pro

Answer 1

In my case I increased performance by changing cache storage method to in memory gzip cache_in_memory_gzip

$cm = \PHPExcel_CachedObjectStorageFactory::cache_in_memory_gzip;
\PHPExcel_Settings::setCacheStorageMethod($cm);