Hi, I'm running some report generation under JBoss. Report compilation is fast, but filling the report takes minimum 5 seconds, sometimes it takes 14 seconds. I'm using fill method of JasperFillManager. There are one or two sql inside the report, but the returned data is small. I debugged the process and it seems like problem is not with the sql. As far I see those seconds are spent when jasper api is filling the details inside the report. And the fun part is that under Glassfish, using java 7, one report generation takes around 1-2 seconds. But under JBoss 7, java 8, it takes 4-15 seconds. I tried to play with the garbage collection, memory optimizations. I tried different jdt compilers, newer jasper api but nothing changed. So I'm stucked right now. Maybe someone already solved this, or had similar problem(s). Any advice? Jasper version: 5.5.1 by the way (I tried 6.x as well)