How can I reduce executed queries in Laravel? - laravel

Question

I have about 6 custom attributes on my model, and in my blade view, I loop through filtered models and use these attributes in some if-else statements, but it takes a lot of time to render, as it executes a lot of queries.
Here is an example of an attribute I have.
/**
* Determine if an invoice is due.
*
* #return bool
*/
public function getInvoiceDueAttribute()
{
if (!$this->invoice_frequency) {
return $this->finished && (!$this->invoiced || $this->outgoing_invoices()->whereNull('invoice_number')->count() > 0);
}
$last_invoice = $this->outgoing_invoices()
->where('invoiceable', true)
->latest()
->first();
return ($last_invoice ? $last_invoice->created_at : $this->created_at)
->startOfMonth()->addMonth($this->invoice_frequency)->isPast();
}
Blade:
#foreach($building->projects as $project)
...
<td class="text-center text-nowrap align-middle">
<a href="{{ route('outgoing-invoices.indexPre', ['project' => $project->id]) }}"
class="btn btn-sm btn-{{ $project->invoice_state_color }} #cannot ('Invoice view') disabled #endcannot">
#if ($project->invoice_ok)
<i class="fa fa-check"></i> Számlázva
#elseif ($project->invoice_in_progress)
<i class="fa fa-rotate-right"></i> Folyamatban
#elseif ($project->invoice_due)
<i class="fa fa-times"></i> Számlázatlan
#else
<i class="fa fa-times"></i> Nem esedékes
#endif
</a>
</td>
<td class="text-center text-nowrap align-middle">
#if ($project->invoice_with_project_id)
Havi riportban
#else
<a href="{{ route('outgoing-invoices.index', ['project' => $project->id]) }}"
class="btn btn-sm btn-{{ $project->payment_state_color }} #cannot ('Invoice view') disabled #endcannot">
#if ($project->payment_ok)
<i class="fa fa-check"></i> Nincs fizetetlen számla
#elseif (is_null($project->payment_ok))
<i class="fa fa-times"></i> Nem esedékes
#else
<i class="fa fa-rotate-right"></i> Folyamatban
#endif
</a>
#endif
</td>
...
#endforeach
To be clear, my goal is to improve performance by reducing queries or any other way.
I also accept best-practice advice for any part of my code. Thank you for your help!