With really huge changelists the p4 plugin can run out of java heap space. At least it looks like the reason for memory problems would be huge changelog.xml files. An example case:

• a changelist with > 400000 files
• results in a changelog.xml size > 110MB
• Jenkins runs out of memory: java.lang.OutOfMemoryError: Java heap space

Maybe there should be an option to limit the amount of files that p4 plugin reads to from changelists?