(See https://www.techmikael.com/2018/08/an-even-better-bundle-optimization.html for an even better solution)
When I wrote the Modern Script Editor web part I went with using Office UI Fabric React (ouifr) for the editor UI. The web part bundle yields a zipped script file of 84KB when used on a page. Not that much really, and it will be cached in the browser. But most of the bundle size is due to the use of ouifr in the edit experience of the web part – not needed in view mode for a page.
Thus I’ve had a nagging feeling working on my mind for a while, and it occurred to me; why can’t I have the editor experience separate from the run-time experience?
And you can!! which I will explain how further in this post.
The result is that the updated web part now will download 4KB zipped on run-time instead of 84KB. A whopping 95% decrease. The editor experience will be another 141KB, which is more in total than before, but this only happens when you edit the page and web part – certainly a good trade off.
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