[Observium] Juniper port polling problems

Hi, I have observium 0.16.1.7533. It has problems with two machines: Juniper mx240 with JunOS 15.1R2 and Juniper EX4550-32F with JunOS 12.3R12.4.

This devices very slow polling ports information. Here I found the same problem: http://jira.observium.org/browse/OBSERVIUM-1695 http://jira.observium.org/browse/OBSERVIUM-1695 But there it is written that "junipers have functionally broken SNMP stacks".

Is there any solution to this issue? Are there any special settings or modules for JunOS ?

Thanks.