Next.js plugin terribly slow

[jeiea]

It increases the dev server startup time from 3 seconds to as much as 15 seconds.

I won't provide a reproducible example; this is just for your information.

[samuelstroschein]

which next js version?

[jeiea]

14.2.5

[samuelstroschein]

so webpack. would be interesting if turbopack has the same issue. i'll keep the issue open for others to upvote the issue and comment

[jeiea]

On my project it was reproducible on both webpack and turbo.

[samuelstroschein]

Might be this next js "bug" we encountered on discord a while back. https://discord.com/channels/897438559458430986/1245064899739254947/1245649365939392512

1. Using middleware at all makes the app slower, since pages aren't prerendered.
2. Accessing (not setting) headers() seems to be very slow. Paraglide-Next uses the headers to pass the locale from the middleware to the app.