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HeinrichApfelmus / threepenny-gui

GUI framework that uses the web browser as a display.
https://heinrichapfelmus.github.io/threepenny-gui/
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DOM building is very slow #131

Closed blitzcode closed 7 years ago

blitzcode commented 8 years ago

Building up even just a few dozens of DOM elements can take a very long time. Example:

https://github.com/blitzcode/hue-dashboard/blob/8a9e5ac466aadd8b6f8fa4557fe2d931a89d03d2/WebUI.hs#L124

On localhost it can easily take a second for the content to arrive in the browser's DOM, on a mobile device over LAN it can take several seconds. I suspect this is because there's back & forth between threepenny and the browser for every single element added? A workaround could be to just build up some HTML locally with something like blaze-html, but I'd of course think it would be better if threepenny just did the batching by itself.

The performance right now makes it difficult to generate even a moderately complex page in time, dynamically building things like a modal dialog etc. seems impractical.

blitzcode commented 7 years ago

Sure, closed! This was certainly a lot of work to figure out how to solve correctly, thanks!