Feeds Graph visualization for feeds included in a node that contains many feeds

Hello,

I have no graph visualization for all feeds included in a node that contains 80 feeds but it works fine with feeds included in a node that contains 10 feeds.
Is there a limitations for feeds visualization ? This issue appears in vis and graph modules.

My configuration:
emoncms 9.9.9 installed on Linux
Module Graph 1.2.3

Thank you for your help
BR