Laravel : Task Scheduling [ In Parallel ]

I have multiple tasks that need to be done every hour or two. All of them have been scheduled via Laravel using below comamnds as cron jobs

$schedule->command('email:notifications1')
            ->cron('15 * * * * *');
$schedule->command('email:notifications2')
            ->cron('15 * * * * *');
$schedule->command('email:notifications3')
            ->cron('15 * * * * *');

Issue: All of the above tasks are pretty time consuming & it seems from the results that these tasks are not running in parallel. And each tasks runs after the previous has ended.

Requirment How can i run them in parallel? I want all tasks to be executed (in parallel) as soon as the clock tick the specified time.

Laravel Version 5

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