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; ?>