I'm in server mode, Astro 5.2.3, dev mode. When i load page i see in loading timeline 'waiting for server' is kinda long - several seconds. How do i profile to some waterfall what exactly takes so long?
#How do i profile page build time?
dim glen
woven forgeBOT
Hi @dim glen. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
To profile page build time in Astro, especially when you're experiencing long "waiting for server" times in dev mode, you can use the built-in bundle analyzer. This tool can help you visualize what's taking up time during the build process. Here's how you can set it up:
- First, install the
rollup-plugin-visualizerpackage:
npm install rollup-plugin-visualizer --save-dev
- Then, add the plugin to your
astro.config.mjsfile:
import { defineConfig } from 'astro/config';
import { visualizer } from "rollup-plugin-visualizer";
export default defineConfig({
vite: {
plugins: [visualizer({
emitFile: true,
filename: "stats.html",
})]
}
});
- Run your build command. After the build is complete, you'll find a
stats.htmlfile in your project'sdist/directory.
This visualization will help you see what's included in your bundle and potentially identify any large dependencies that might be slowing down your build time.
For more detailed information on this process, you can refer to the Analyze bundle size recipe in the Astro documentation.
Keep in mind that while this method is helpful for analyzing bundle size, it might not give you a complete picture of server-side rendering time. For more specific server-side profiling, you might need to use additional tools or techniques that are not covered in the provided knowledge sources.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
dim glen
----------------------
To profile page build time in Astro, especially when you'...
you've provided solution for astro run build. I'm interested in profiling what happens while i'm getting different pages while im in astro run dev mode @woven forge
woven forgeBOT
Let me check the knowledge base for you again. One moment! :books:
I apologize for the confusion in my previous response. You're correct that the solution I provided was more relevant to profiling build time rather than dev mode performance. Let me address your specific question about profiling page loads in astro dev mode.
For profiling what happens while getting different pages in astro run dev mode, Astro provides a built-in development toolbar that can help you inspect and debug your pages. This toolbar includes several useful features for performance analysis:
-
The Astro dev toolbar is enabled by default and appears when you hover over the bottom of the page in your local browser preview while the dev server is running Dev toolbar.
-
One of the built-in apps in the dev toolbar is the Audit app. This app automatically runs a series of audits on the current page, checking for common performance and accessibility issues. When an issue is found, a red dot will appear in the toolbar Dev toolbar.
-
You can click on the Audit app to see a list of results and it will highlight related elements directly on the page.
While this built-in tool provides some insights, it's important to note that it's not a comprehensive profiling solution. The Astro documentation states:
"The basic performance and accessibility audits performed by the dev toolbar are not a replacement for dedicated tools like Pa11y or Lighthouse, or even better, humans!" Dev toolbar
For more detailed profiling of server-side rendering time in dev mode, the knowledge sources don't provide specific information. You might need to use external tools or browser developer tools to get a more comprehensive view of what's happening during page loads.
If you're specifically interested in the "waiting for server" time, you might want to look into your server-side code, database queries, or any heavy computations that might be happening during page requests. However, the exact method to profile these aspects isn't covered in the provided knowledge sources.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
dim glen
----------------------
I apologize for the confusion in my previous response. Yo...
dev toolbar shows astro specific potential problems, but i want to anaylse Server Timing, like for eslysia i can install Server Timing Plugin: bun add @elysiajs/server-timing import { Elysia } from 'elysia'
import { serverTiming } from '@elysiajs/server-timing'
new Elysia()
.use(serverTiming())
.get('/', () => 'hello')
.listen(3000) Server Timing then will append header 'Server-Timing' with log duration, function name, and detail for each life-cycle function.
To inspect, open browser developer tools > Network > [Request made through Elysia server] > Timing. Is there anything like this for astro in server mode? @woven forge
woven forgeBOT
Let me check the knowledge base for you again. One moment! :books:
I apologize, but based on the knowledge sources provided, there doesn't appear to be any specific information about a Server Timing feature or plugin for Astro that's similar to what you've described for Elysia.
Astro does provide some built-in development tools, like the dev toolbar we discussed earlier, but these are more focused on general performance and accessibility audits rather than detailed server timing information.
The closest thing mentioned in the knowledge sources is the ability to customize the Astro dev server. For example, you can set custom HTTP response headers in astro dev and astro preview modes:
{
server: { headers: {} }
}
However, this doesn't provide the kind of detailed server timing information you're looking for.
It's possible that such a feature or integration exists for Astro, but it's not mentioned in the provided knowledge sources. You might want to check the Astro Integrations Directory for any community-developed tools that could provide this functionality, or consider developing a custom integration if one doesn't exist.