Slow connections
What works on a slow connection? From 128 Kbps to 5 Mbps
Short answer: below about 500 Kbps you can message, email and make audio-only calls, but ordinary web pages take half a minute or more and video barely plays. Around 1 Mbps, low-resolution video and most calls without video work. From about 3–5 Mbps, one person can stream HD video or join a video meeting. Mobile data slowed after an allowance runs out, rural DSL and congested satellite links all sit in this range, so it is worth knowing where the lines are.
Kbps, Mbps and what the numbers mean
1 Mbps = 1,000 Kbps. A connection test reported as 0.25 Mbps is 250 Kbps. Files are measured in bytes, so divide by 8: 256 Kbps moves about 32 kilobytes per second. Our converter does the arithmetic for Kbps, Mbps, Gbps, KB/s and MB/s.
How long everyday things take at slow speeds
The median mobile web page weighed 2,311 KB in October 2024, according to the HTTP Archive's Web Almanac page weight chapter. That makes it a good yardstick. Times below are pure transfer time at the full measured speed; real pages take longer because of latency and the many separate requests they make.
| Speed | Median web page (2.3 MB) | 1 MB photo | 100 MB app update |
|---|---|---|---|
| 128 Kbps | about 2 min 24 s | about 63 s | about 1 h 44 min |
| 256 Kbps | about 72 s | about 31 s | about 52 min |
| 512 Kbps | about 36 s | about 16 s | about 26 min |
| 1 Mbps | about 18 s | about 8 s | about 13 min |
| 2 Mbps | about 9 s | about 4 s | about 7 min |
| 5 Mbps | about 4 s | about 1.6 s | about 2.7 min |
Worked example: 2,311 KB × 8 = 18,488 kilobits; at 256 Kbps that is 18,488 ÷ 256 ≈ 72 seconds.
Minimums from the services themselves
| Activity | Minimum or recommended speed | Source |
|---|---|---|
| YouTube, basic playback | 500+ Kbps; 360p 0.7 Mbps; 480p 1.1 Mbps; 720p 2.5 Mbps | YouTube Help |
| Microsoft Teams audio call | 58 Kbps each way | Microsoft Learn |
| Zoom audio (VoIP) | 60–80 Kbps | Zoom support |
| Zoom 1:1 video at 720p | 1.2 Mbps each way | Zoom support (same page) |
| Netflix HD (720p) | 3 Mbps or higher | Netflix Help |
What each speed band is good for
| Band | Works | Struggles |
|---|---|---|
| Under 256 Kbps | Text messaging, email without attachments, audio calls on a good day, maps already downloaded | Web pages, video, app updates, photo uploads |
| 256–999 Kbps | Audio calls, light browsing with patience, 360p video near 1 Mbps | Video calls, more than one user at a time |
| 1–3 Mbps | Video calls with video off or at low resolution, 480p–720p video for one person | HD streaming, large uploads, two people working at once |
| 3–5 Mbps | One HD stream or one video meeting | Several people online together, 4K, cloud backup |
Making a slow connection usable
- Stop background traffic first. Phone backups, app auto-updates and cloud sync can take the whole link. On a laptop, mark the connection as metered.
- Turn video off in calls and keep audio on; that drops the need from megabits to well under 100 Kbps in the vendor figures above.
- Set streaming apps to a fixed low quality instead of "auto", which keeps trying higher quality and rebuffering.
- Download maps, playlists and documents while you still have a fast connection.
- Watch latency, not only speed. On a slow link, any upload fills the queue quickly and makes everything else feel frozen. See latency vs bandwidth.
Is the slowness the line or the plan?
If speed fell to a round figure like 128 or 256 Kbps after you used a lot of data, your plan has almost certainly throttled you after a usage allowance; the provider's app or account page will show it. If speed varies through the day and is worst in the evening, it is congestion. If speed is low even right next to the router on a cable, it is the line or the plan, and testing at several times of day gives you evidence to take to the provider.
Related
Testing a phone hotspot · Download time calculator · Streaming bandwidth calculator · Kbps speed test