nxos vlan playbook with nested, conditional loop.

nxos_vlan_pb.yml

- hosts: localhost
  gather_facts: False

  vars:
    switches:
      - hostname: switch01.example.com
      - hostname: switch02.example.com
    subnets:
      general_use: 
        subnet: 10.0.0.0/16
      specific_use:
        subnet: 10.1.0.0/24
        vlan: 100

  vars_prompt:
    - name: "cisco_username"
      prompt: "Username"
    - name: "cisco_password"
      prompt: "Password"
      private: yes

  tasks:
    - name: vLAN
      nxos_vlan:
        vlan_id: "{{ subnets[item[1]]['vlan'] }}"
        name: "{{ item[1] }}"
        host: "{{ item[0]['hostname'] }}"
        username: "{{ cisco_username }}"
        password: "{{ cisco_password }}"
        transport: nxapi
        use_ssl: yes
      with_nested:
        - "{{ switches}}"
        - "{{ subnets }}"
      when: "{{ subnets[item[1]]['vlan'] | default('skip') != 'skip' }}"
      delegate_to: 127.0.0.1

Either way, you should have switches in the inventory file. It's good practice.

I'd try without SSL just curious if that speeds things up.