Rendering of templates is very-very fast Task, because it just
concatenation function. Less than 0.1ms. What wasting time do you mean? You
can waitng all data, and push it all into template engine. It will be
faster than if you do it by parts, because synchronous algorithm of
template engine faster and easier than asynchronous.
вторник, 27 ноября 2012 г., 20:26:56 UTC+4 пользователь Jeff Barczewski
написал:
>
> @Oliver Here is an example where an asynchronous template engine like dust
> could provide a nice optimization in time to render a page from server to
> browser.
>
> Let's say a dynamic page on the server is rendered from a layout and it
> depends on several pieces of data from the database all of which can vary
> from page to page:
>
> - javascript
> - css
> - main data
>
> I can fetch all of them in parallel from one or more databases and as soon
> as I have the javascript and css, I can start rendering and streaming the
> head, so the browser can fetch and parse, then when the data is ready, I
> stream the rest.
>
> Assuming the javascript and css data can be fetched more rapidly than the
> main data (which could be using a complicated query), then I am not wasting
> time waiting for everything, the browser can be using the time to prepare
> what it has, then when the final data arrives, it can instantly finish the
> render.
>
> Given this template:
>
>
> <html>
> <head>
> {javascript}
> {css}
> </head>
> <body>
> {mainData}
> </body>
> </html>
>
>
>
> It can stream the template in chunks from the server to the browser,
> blocking at {javascript} until it has that data, then blocking at {css},
> then {mainData}.
>
> So as the data becomes available, more chunks can be delivered to the
> browser. Assuming these are all fetched in parallel and that javascript and
> css return first, we will have a nice optimization by being able to get the
> browser javascript and css to parse, while it is waiting for the main part
> of the page.
>
> It is mostly useful for rendering templates on the server. If you are
> rendering on the client, then you will likely be synchronous.
>
>
> Jeff
>
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