After a first problem of OOM : https://issues.jenkins-ci.org/browse/JENKINS-15491 , I've updated Jenkins to 1.488.
But now, Jenkins puts a lot of time to respond after 2 days of use and finally crashes.

I've analysed the heap dump and the GC log with IBM Support Assistant.
The results are attached.

Thanks in advance from any help !
Michaël Pailloncy