Comments (4)
Ok, so to be clear the potential performance issues lie within the server side rendering logic. We have to walk your react element tree prior to render (and execute componentWillMount along the way to keep in line with a "standard" server side render). This allows us to discover AsyncComponent instances and prebake them prior to render. Although this operation isn't as expensive as an actual render as we don't generate the DOM it can still be quite wasteful if you have a deep tree. Therefore to allow for optimisation I am thinking of introducing a new configuration object property for the createAsyncComponent helper: ssrMode. It will support the following values:
- "render" : Default. In this mode a server side render will parse and resolve your AsyncComponent and then continue walking down through the child elements of your resolved AsyncComponent. This is the most expensive operation.
- "defer" : When set your AsyncComponent will not be resolved during server side rendering and will defer to the browser/client for resolving and rendering of it. This is the cheapest operation.
- "boundary" : In this mode your AsyncComponent will be resolved and rendered on the server, however, it's children will not be walked over to try and find nested AsyncComponent instances. If there are any nested instances their resolving and rendering will be deferred to the browser/client.
Understand your own applications needs and use the options appropriately . I personally recommend using mostly "defer" and a bit of "boundary". Try to see code splitting as allowing you to server side render an application shell to give the user perceived performance. Of course there will be requirements otherwise (SEO), but try to isolate these components and use a "boundary" as soon as you feel you can.
Thoughts?
from react-async-component.
Also, the above will deprecate the current "defer" configuration property.
from react-async-component.
Works a treat!
from react-async-component.
Released in 0.2.0
🎉
from react-async-component.
Related Issues (20)
- if more the one same async components are rendered in same page, only one will be rendered
- Chunk rendered in the server is requested in the client again HOT 1
- Need Help : How can I solve "System is not defined" HOT 5
- Error walking your react tree HOT 1
- No-match routes rendered during async loading HOT 1
- Combining with <link rel="prefetch" /> results in loading async components twice
- Upgrade to support react-async-bootstrapper 2
- App component rendered twice because of AsyncComponentProvider wrapper in RU
- Solved : Flashing LoadingComponent and render twice
- getErrors missing after migration to 2.0.0
- When used with react-hot-loader, async component gets stuck on the loader HOT 3
- Async component not rendering on directly open page
- Client error: Failed to resolve asyncComponent on Safari 11.1
- React.Children.only seems to fail on IE11 HOT 1
- Is it possible to load the async'd components from a custom URL? HOT 1
- Two same simultaneously async components HOT 5
- Informing about React.lazy() HOT 2
- Cannot read property 'helmetInstances' of undefined HOT 3
- migrate to New Context API
- Error async-component, state not reloaded after error
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from react-async-component.