How to make your video load fast in any country: HLS explained
Updated: November 3, 2026
Few things drive viewers away like a video that keeps buffering. If your audience is spread across countries and connections (fiber, 4G, café Wi-Fi), the video has to adapt to each one. That’s the idea behind HLS. Here’s what it is, how it works and what you can do so your videos load fast.
Why a video loads slowly or buffers
- The file sits on a distant server and every request takes time to arrive.
- A single heavy file is served: a 10 Mbps 1080p video won’t fit through a 3 Mbps 4G connection.
- The viewer’s connection changes while watching (for example, on public transport).
- The page loads the video before the viewer presses play, slowing everything else down.
What HLS is
HLS (HTTP Live Streaming) splits the video into chunks of a few seconds and prepares it in several qualities (for example 360p, 720p and 1080p). The player requests chunks one by one and, depending on how fast they arrive, picks the quality of the next one.
The result: the video starts right away at a low quality, moves up to HD if the connection allows and drops automatically if it gets worse, instead of stopping. It’s what the big streaming platforms do.
The other half: a content delivery network (CDN)
Even a well-prepared video is slow if it travels from a single server on the other side of the world. A CDN keeps copies on servers spread across many countries and delivers each chunk from the one closest to the viewer.
On Dembed videos are delivered from Cloudflare’s network, present in hundreds of cities, and they don’t go through the platform’s own server.
How Dembed applies it
- Progressive playback from the start: the video can be watched as soon as the upload finishes.
- When enabled, the video is also prepared in HLS with several qualities, and the player switches to HLS automatically.
- Viewers can pick the quality manually from the gear icon, or leave it on “Auto”.
- The iframe is lazy-loaded: it doesn’t slow your site even with several embeds.
What you can do
- Upload an H.264 MP4 at a reasonable bitrate: a huge file doesn’t look better on a phone.
- Use a good thumbnail: viewers see something appealing while the video starts.
- Embed with loading="lazy" (Dembed’s code already includes it) and a 16:9 container so the page doesn’t jump while loading.
- If your audience is mostly mobile, test the video on mobile data before publishing.
Frequently asked questions
Yes. Safari plays it natively and in other browsers the player handles it with JavaScript. It works on phones, tablets and computers.