0.005 push messages per second (= 18 per hour) is not necessarily a large value unless you only receive about the same number of upload requests per hour. In that case the rest of the network cannot connect to you properly.

How many HTTP HEAD Requests do you receive per second?

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob