While testing out both Remix and Next.js, I noticed that the fetch polyfill for Next.js seems to be significantly faster than the Remix version. This is a simple reproduction to demonstrate the differences.

Here are the results from running node index.mjs:

Next 655
Next 593
Next 549
Next 573
Next 523
Next average 578 

Remix 702
Remix 743
Remix 636
Remix 660
Remix 617
Remix average 671 

One thing that is odd is that Next seems to perform even better when run within a Next.js app. To see this version of the example, run npm run dev, load the page at localhost:3000, and observe the output in your terminal. I see something like this:

Next 264
Next 259
Next 284
Next 310
Next 275
Next average 278 

Remix 718
Remix 669
Remix 686
Remix 747
Remix 661
Remix average 696 

You can try changing the fetch url in test.mjs to something like https://www.google.com. In that case, the results are almost identical in Node, but Next is still significantly faster when run with npm run dev