Thanks for the fast reply!

About the client:
    - the client is implemented in node.js (not by me, so I don't know it in
detail)
    - it establishes 25000 connections over a period of 4 minutes
    - the clients publish every 4 minutes a small message to a
client-specific topic (i.e. the number of topics = the number of clients)
    - there are no subscriptions
    - publishing is done with retain=false, dup=false and qos=0

When all the clients are connected, I start another machine which launches
another set of 25000 clients.  I can only go to 50000 clients like this. 
With the Mosquito broker, the same test setup scales to 150000 connections. 
Given the fact that Mosquito is single-threaded, the expectation was that we
could achieve 300000 connections with Apollo.

I've verified the documentation, and I think my configuration is correct.

Best regards,
Frank  



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