What are runtimecompiler and runtimeonly

The outline

1.runtimecompiler  and  runtimeonly What is it? 
2.runtimeonly advantage 

1. runtimecompiler and runtimeonly What is it? ？

runtimecompiler
Template rendering DOM Pattern ：template -> ast -> render -> vdom -> UI

new Vue({
    
  el:'#app',
  components:{
    App},
  template:'<App/>',
})

runtimeonly
Template rendering DOM Pattern ：render -> vdom -> UI

new Vue({
    
  el:'#app',
  render:h=>h(App)
})

2.runtimeonly advantage

runtimeonly advantage ： Higher performance , Less code