advice on optimizing my shiny app for speed

Is there any

List
Blog
Book
Page

Where we can see how to optimize shiny code.

I wrote a demo shiny app for elasticsearch api. And I have used renderUI to generate selectinput. I might need to publish this app for general public. I don't want people to say that shiny is slow.

Even in hadleys book optimization. I could not find a list of optimization for shiny

https://vikramsinghrawat.shinyapps.io/elasticsearch/

Please do reply.

I'm actually pretty keen to hear advice from the rest of the community, but a few pointers,

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