Official Support Area, Q&As, Discussions, Suggestions and Bug reports.
Forum's Guidelines
I have a look at spout, it is possible to use spout with koolreport. I mean not now, but it is possible to integrate spout to koolreport. May be a new package called "Spout" or few classes added to Excel package to take responsible for writing large file size csv and excel file.
Let KoolReport help you to make great reports. It's free & open-source released under MIT license.
Download KoolReport View demo