doesnthave() taking too long to query in laravel

I am write database query which fetch the record which does not have specific relation i am simply counting the number of records which doesn't have relation . But it is taking too long .

Here is my query

 Consignment::doesntHave('invoice_charges')->count()

But when I write query without relation it gives me quick result


Consignment::count()

What could be the reason . And how i can make it work?



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