my powershell code is so slow to delete all the event subscriptins from the system topic.

# Get all event subscription names associated with the system topic
$subscriptions = az eventgrid system-topic event-subscription list --system-topic-name $systemTopicName --resource-group $resourceGroupName --query "[].name" -o tsv

# Iterate through each subscription and delete it
foreach ($sub in $subscriptions) {
    Write-Host "Deleting event subscription: $sub"
    az eventgrid system-topic event-subscription delete --system-topic-name $systemTopicName --resource-group $resourceGroupName --name $sub --yes
}

Is there any faster way to remove all the event subscriptions?