[PDFBOX-4877] Matrix class performance improvements

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.20, 3.0.0 PDFBox
• Fix Version/s: 2.0.21, 3.0.0 PDFBox
• Component/s: Parsing, Text extraction
• Labels: Optimization
• Assignee: Andreas Lehmkühler
• Reporter: Alfred
• Created: 11/Jun/20 06:40
• Updated: 21/Aug/20 04:55
• Resolved: 28/Jun/20 12:54

Description

I am testing text extraction from PDF and profiling the execution.

I found that the third major time consumer is with matrix multiplicaitons.

The Matrix class spends large amounts of time copying results to new instances. 

Also, the if statements are slowing down execution as they kill performance in modern CPUs.