global mixin and performance

[chriscdn]

There is performance problem when registering the mixin as a global. The mounted() hook gets called on each component, which means potentially 100s of calls to window.addEventListener.

window.addEventListener('online',  onlineHandler)
window.addEventListener('offline',  offlineHandler)

Chrome seems to handle this fine. IE, not so well.

[filrak]

@chriscdn this is why you have VueOfflineMixin which you can inject instead of plugin

[filrak]

There will be an huge update next week tho which should eliminate this problem