I'm doing some processing with fonts and I have noticed that the ResourceCache seems really slow if the jvm works with more memory: processing with 500 Mb of max heap size is faster (1 min 30s) than using 1500 Mb (2 min).
Adding the following parameter to the jvm: -XX:SoftRefLRUPolicyMSPerMB=1 improves a lot the performance (1min for 500 Mb of heap and 43s for 1500 Mb of heap) but I have noticed that with more complex files and processing the issue still appears (i.e: performance is better with less memory) and sometimes I get an "OutOfMemory" exception (which doesn't happen if I completely disable the cache). Steps to reproduce: get TestResourceCache.java and manyfonts.pdf from here: https://gofile.io/d/Lrcg4v and run: java -Xmx1500m -cp "pdfbox-2.0.21.jar;commons-logging-1.2.jar;fontbox-2.0.21.jar;." TestResourceCache manyfonts.pdf If you want to disable ResourceCache: java -Xmx1500m -cp "pdfbox-2.0.21.jar;commons-logging-1.2.jar;fontbox-2.0.21.jar;." TestResourceCache manyfonts.pdf -n And using the XX:SoftRefLRUPolicyMSPerMB flag: java -Xmx1500m -XX:SoftRefLRUPolicyMSPerMB=1 -cp "pdfbox-2.0.21.jar;commons-logging-1.2.jar;fontbox-2.0.21.jar;." TestResourceCache manyfonts.pdf If you disable the ResourceCache then processing takes about 35 secs. In this case I can simply disable the cache, but most of the time the cache gives better performance, so, I would like to keep it. I have tested in Windows and Linux environments and with the previous version of pdfbox. Results are the same. About the parameter -XX:SoftRefLRUPolicyMSPerMB: https://bugs.java.com/bugdatabase/view_bug.do;jsessionid=8a08ffe78680b155d0cc88c63d76?bug_id=6835406 Esteban Ruiz
