copy `vendor/magento/module-customer/view/frontend/templates/account/authentication-popup.phtml` to `app/design/frontend/{your-template}/Magento_Customer/templates/account/authentication-popup.phtml`
And remove:

    <?php if ($viewModel->isGlobalScopeEnabled()): ?>
      ,
      "Magento_Customer/js/customer-global-session-loader": {}
    <?php endif; ?>