Ask HN: Where do you host your CSS files?

We currently have a web app hosted on the cloud. The HTTP server does server-side rendering, including serving up static CSS and SVG files.

For reasons, the web server framework doesn't support caching out-of-the-box and we hand-roll our own.

I thought we might as well complexify our deployment step instead and reap some performance benefits. Immediately, I thought to use Amazon S3 for the CSS files. Does any one else do this? Is there something lower latency than S3?