https://bz.apache.org/bugzilla/show_bug.cgi?id=61665
Bug ID: 61665
Summary: XSSF is much slower than HSSF
Product: POI
Version: 3.17-FINAL
Hardware: PC
Status: NEW
Severity: critical
Priority: P2
Component: XSSF
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
On making big amount of cell writes 10000-30000, XSSF speed is much slower than
HSSF, about x5 - x10, what in general not suposed to be so, or at least not
that much.
It can be reproduced by Apache POI test class:
https://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/ss/examples/SSPerformanceTest.java.
According another message on stackoverflow:
https://stackoverflow.com/questions/34246083/apache-poi-performance
the problem could be not directly in poi, but in synchronized calls of xmlbeans
and poi-ooxml-schemas.
Please also take a look at this messages:
https://stackoverflow.com/questions/34995058/apache-poi-much-quicker-using-hssf-than-xssf-what-next
http://apache-poi.1045710.n5.nabble.com/Performance-Issue-with-XSSF-as-compared-to-HSSF-in-POI-3-7-td3307475.html
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