Alerts/Pulse taking too much time to reach slack channel

hi we have scheduled 14 alerts which should get triggered at 7am daily.
We have observed that the alerts are reaching to the slack channel between 7.30am to 9am.
After doing some analysis on task_history table i have observed that first pulse gets triggered at 7.30am( not sure why 7.30am even when scheduled time is 7am).
i have also observed that only one pulse gets executed at a time and next waits in queue. which is causing the delay in pulse execution.
This is causing a issue because the alert which is supposed to be sent to slack at 7am is sent at 8.30am.
Is there a config to enable parallel execution of pulses?
please refer to screenshot

Hi @himanshu15y
Post "Diagnostic Info" from Admin > Troubleshooting.
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