Can not open multi pages at the same time, is there a limit?

For example,  I created file named "demo.vue"  and added it into "router.js".   And, I open "http://localhost:8080/#/demo" many times.   The first six times is successful to loading the page. Then, this 
page can't load more.  Other page can't load,too.   
PS:If you close one that loaded successfully, those pages that waiting to be loaded can  load successful.
