Dynamically Rendering with Node.js Emails is Slow

I want to use Maizzle to dynamically render emails with Node.js. For example to include the username in the content.

Is there a recommended approach to do this? Because my current implementation is very slow:

app.get('*', async (req, res) => {
  const template = await fsPromises.readFile(
    path.join(basePath, 'src/templates', `${req.path}.html`),
  )

  const configPath = path.join(basePath, './config.production')
  const {html} = await Maizzle.render(template.toString(), {
    maizzle: require(configPath),
  })

  res.send(html)
})

…rendering one email on my Kubernetes cluster takes 18 seconds. I guess it’s because TaildwindCSS needs to be compiled every time.

There must be a better way?!

[claudiu-clearpoint]

With the Maizzle version 3.6.1, env: ‘production’ and without purge or with but undefined or array and is rendering it in 5 sec which is less than 18sec but is still slow. I also noticed the warnings: warn - You have enabled the JIT engine which is currently in preview. warn - Preview features are not covered by semver, may introduce breaking changes, and can change at any time.

[claudiu-clearpoint]

without mode jit will be 23 sec. probably the 5 sec is the best performance for the render function but because is too long, the alternative solution of the render function from flolu seems to be the only solution as it will be under 1 sec