passenger 3.0.19 launching very slow in production mode

[A. Melle]

Hi,

I have multiple instances of the same app running on nginx / passenger. Swapping from development mode to production mode made the app faster, but the loading time for nginx / passenger changed from several seconds to about 25 minutes. 

CPU utilization is low and memory usage is about 50%.

worker_processes  6;

passenger_max_pool_size 40; 

I'm not sure why there is such a significant difference. 

any ideas?