Slow TTFB on initial document request NextJS on Netlify

daniel · April 15, 2021, 8:42pm

We’ve been testing out NextJS on Netlify and in doing so have noticed that the TTFB on the initial document request (not subsequent resources) is quite slow often 1.25s - 1.75s.

One site has a domain attached, while the other is using the default Netlify domain… so can rule out it being a domain thing. For those familiar with Shopify, I’ve seen this happen on their hosted theme environments when there’s a lot of server side rendering going on (excessive liquid loops)… so I’m wondering if maybe that’s somehow the case here too with NextJS? That being said, I’m seeing this on the index pages which is more-or-less all static content.

Wondering if anyone else has run into this using NextJS on Netlify. Know things are evolving rapidly here, but figure performance is why we bother with most of this, right?

hillary · April 23, 2021, 3:00pm

Hey there, @daniel

Welcome to the Netlify Forums Sorry to be slow to respond here-- it looks like this thread has been quiet since last week. Are you still encountering this? If so, can you share your most recent build log with us?

Veera_Health · May 17, 2021, 8:59am

We are experiencing a similar issue. TTFB is over 4s for SSG pages.

Is there any workaround for this?

perry · May 21, 2021, 10:02pm

hi there, sorry you are experiencing any slowness. Capturing a HAR file would be super helpful for us to analyze why this might be the case:

https://toolbox.googleapps.com/apps/har_analyzer/

furthermore, if this seems next related, it would be a good idea to look through any issues on this repo:

our next plugin is rapidly evolving, indeed, so sometimes going straight to github will get the attention of the next team faster!

Veera_Health · May 25, 2021, 5:16am

Hey Perry,

Please see the screenshots below. It is constantly varying between 4s and 7s.

Veera_Health · May 25, 2021, 5:17am

hillary · May 26, 2021, 2:41pm

Hi there, @Veera_Health

Thanks so much for following up, I appreciate it. Can you link us to the website? Additionally, are there any known large files or images on this website?

jdubs · June 21, 2021, 12:11am

Hi @hillary - I’m experiencing a very similar issue to that described in the initial post. Our TTFB times are coming in at a pretty consistent 4-5 seconds.

To answer the questions asked in the thread:

The domain is https://uat.dev.dulux.com.au
This site id is 8ad36bfc-162f-44c0-bcf9-afdec713bfdb
The latest build log is copied below
I can’t attach the HAR file captured today but the image of the output is attached
We are using the nextjs plugin and webpack 5, I can’t see any open issues which relate to this

We have recently moved our functions geographic location to ap-southeast-1 (ours is an Australian site) but that hasn’t yielded any improvement.

Thanks very much,

James

Latest build log

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9:54:14 AM: Page                                                      Size     First Load JS
9:54:14 AM: ┌ λ /                                                     1.18 kB         325 kB
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9:54:14 AM: ├ λ /[...slug]                                            1.16 kB         325 kB
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9:54:14 AM: ├ ● /colours                                              1.12 kB         325 kB
9:54:14 AM: ├ ● /colours/collections/[slug]                           1.06 kB         325 kB
9:54:14 AM: ├   ├ /colours/collections/sample-colour-collection-page
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9:54:14 AM: ├ ● /store-locator                                        3.88 kB         344 kB
9:54:14 AM: └ ● /stores/[slug]                                        4.22 kB         345 kB
9:54:14 AM:     ├ /stores/bunnings-alexandria
9:54:14 AM:     ├ /stores/bunnings-bankstown
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lindsaylevine · June 23, 2021, 1:05am

hey! thanks for all of the info so far! this is a tough one to diagnose off that info alone. would be helpful to know:

what you’re doing in your _app.js and index.js files regarding data/props fetching
it’s slow on the deploy preview links as well?
was this always an issue for you or was this introduced in a specific change/iteration of your site or version upgrade?
this one’s the most annoying but asking you to prune down your site in a new repo to try to reproduce it for us would either (a) help you identify the root cause or (b) give us a repro to work off of

let us know! apologies for the struggles!!

daniel · July 19, 2021, 10:15pm

Still having this, but on a different Next site hosted on Netlify. We’re SSGing most of the pages including the homepage, so it’s a bit odd. Looks like deploying on Vercel w/ the same “yarn build” command eliminates this TTFB issue… so might have to chalk this up to Netlify’s Next plugin. @lindsaylevine

https://ziatile.netlify.app/

https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fziatile.netlify.app%2F

hillary · July 20, 2021, 2:21pm

hey there, @daniel

Thanks for circling back here! Sorry to hear that this issue has cropped up again for you. Can you share answers to any of the questions that @lindsaylevine asked above in the thread? This would help us dig into the situation further.

Thanks again!

daniel · July 20, 2021, 5:29pm

Hey @hillary, so the Vercel + Netlify deployments are both going off the master branch from the same repo. If you run a PageSpeed/Lighthouse test for both (or just visit the site and pay attention to initial load), the TTFB issue is only present on the Netlify deployment.

what you’re doing in your _app.js and index.js files regarding data/props fetching. The only thing going on there is configuration related to styled components.
it’s slow on the deploy preview links as well? Yes
was this always an issue for you or was this introduced in a specific change/iteration of your site or version upgrade? It has been an issue on multiple sites using NextJS on Netlify.
this one’s the most annoying but asking you to prune down your site in a new repo to try to reproduce it for us would either (a) help you identify the root cause or (b) give us a repro to work off of
Sorry, can’t publicly post the repo but you’re welcome to look at our Netlify account (linked to my forum account).

@lindsaylevine

daniel · July 22, 2021, 8:13pm

I’ve seen slower TTFB’s using Next on SSR routes. That plus the fact it’s only happening on Netlify and not Vercel… has me wondering if it’s how Netlify tries to run NextJS. Perhaps in adding the ability to use SSR on Netlify… SSG pages are also being served by some sort of slower server in front… It’s all kind of odd.

@hillary @lindsaylevine

lindsaylevine · July 23, 2021, 2:23am

hey daniel and all! thanks for the answers. i work on the next.js plugin and opened an issue on the repo here Slow TTFB on initial document request · Issue #552 · netlify/next-runtime · GitHub. we have a lot on our plate right now so it may take us a bit to dig into this and investigate, but you can track there and we’ll try to get you answers asap. thanks a bunch again for the info and for your patience!

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