c# - Stopping SqlDependency exceedingly slow -

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i call in c# following stop sqldependency.

rslt = sqldependency.stop(myconnstr, _notificationqueue);

this takes 4-5 seconds. i've put sql profiler see happening , calls following (in single batch) , takes 4-5 seconds:

exec sp_executesql n'begin transaction;          drop service [sqlquerynotificationservice-45558b70-3adc-414b-9f7b-1da40abfc5b6];          drop queue [sqlquerynotificationservice-45558b70-3adc-414b-9f7b-1da40abfc5b6];          drop procedure [sqlquerynotificationstoredprocedure-45558b70-3adc-414b-9f7b-1da40abfc5b6];          commit transaction;',         n'@p2 int', @p2 = 60000

why slow , how speed up?


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