What actually sets the bandwidth
A remote KVM sends a compressed video stream of the target's screen. The vendors document the levers that change how big that stream is. They do not give a single required speed, so this table collects the levers instead.
| Lever | Vendor setting | Documented effect |
|---|---|---|
| Picture quality | Comet Pro Quality: Auto, Low, Medium, High, Ultra-high, Lossless [1] | Higher presets mean a bigger stream |
| Adaptive mode | Comet Pro Mode: Smart or Normal [1] | Smart reduces bandwidth on weak networks [1] |
| Error correction | Comet Pro FEC Packets: 5%, 10%, 15%, 20% (WebRTC FEC) [1] | Adds that share of redundant packets on top of the video |
| Bitrate | PiKVM H.264 kbps [2] | Higher values improve quality and increase network traffic [2] |
| Frame rate | PiKVM V4 60 fps boost [2] | Doubles network traffic compared with the 30 fps default in 1080p [2] |
| Codec | PiKVM legacy MJPEG [2]; JetKVM H.265 vs H.264 [4] | MJPEG uses a huge amount of traffic, cable only [2]; H.265 gives a better picture than H.264 at the same bandwidth [4] |
| Resolution | Capture and EDID limits [3] | 4K real-time video will not fit through the network anyway [3] |
Data use is arithmetic: a calculated table
The vendors do not publish fixed bitrates for their presets, so the rows below are example stream rates, not vendor figures. The conversion is exact. 1 megabit per second for 3,600 seconds is 3,600 megabits, which is 450 megabytes (MB, using 1 MB = 1,000,000 bytes). The last column adds 20% for the highest Comet Pro FEC setting [1], treating the redundancy ratio as extra traffic on top of the stream.
Use it backward too. If your phone's carrier caps hotspot use at a fixed allowance, divide the allowance by the hourly figure for your measured rate to get session hours.
| Example stream rate | Per 10 minutes | Per hour | Per hour with 20% FEC |
|---|---|---|---|
| 1 Mbps | 75 MB | 450 MB | 540 MB |
| 2 Mbps | 150 MB | 900 MB | 1.08 GB |
| 4 Mbps | 300 MB | 1.8 GB | 2.16 GB |
| 8 Mbps | 600 MB | 3.6 GB | 4.32 GB |
Measure your own stream before a trip
The only reliable figure is the one your setup produces. Connect your laptop to your phone's hotspot, reset or note the phone's data counter, and run a ten-minute session at the preset you plan to use. Do real work, such as scrolling a settings page, because a static screen may compress smaller than an active one. Multiply the result by six for an hourly figure, then repeat at a lower preset.
Apple notes that carriers must support Personal Hotspot and that extra fees may apply. It also says Personal Hotspot stays active while the phone is connected to a computer by USB, and recommends turning the hotspot off when you do not need it to avoid unnecessary data charges [5].
- Record the preset, mode and FEC setting with each measurement, so the numbers mean something next time.
- Measure a BIOS screen and a busy desktop separately; plan on the busier figure.
- Repeat once on the home connection's upload side, since that is where the video leaves.
Upload at home, latency in between
The video starts at the KVM, so the stream uses upload bandwidth on the connection where the KVM sits, and download on your phone or laptop. On a home connection with modest upload, check that your measured stream rate leaves room for anything else uploading there, such as backups or cameras.
Latency is a separate problem from bandwidth and needs different settings. Comet Pro offers Latency Mode (Lowest Latency or Smooth Display) and a Direct transfer mode with the lowest latency and lossless quality but no audio [1]. Its absolute mouse mode can show some network delay, so relative mode may feel better on a poor link [1]. Bad Link Mode sends each key as a quick press-and-release to prevent stuck or repeated keys [1]. PiKVM recommends H.264 gop = 0 on a good network, gop = 60 for WebRTC on a bad network, and Direct mode with gop = 0 if WebRTC struggles. It describes Direct as very stable on poor networks [2].
Settings to use on a phone hotspot
These choices come from each vendor's documentation of what saves bandwidth or copes with a weak link. Raise quality only for the moments you need to read small text.
| Goal | Comet Pro | PiKVM | JetKVM |
|---|---|---|---|
| Smallest stream | Quality Low; Mode Smart [1] | Lower H.264 kbps; leave the 60 fps boost off [2] | Quality Low, meant for slow or metered connections such as a hotspot [4] |
| Avoid wasted overhead | Plain WebRTC, or FEC at 5% [1] | Avoid MJPEG [2] | H.265, which JetKVM says gives a better picture than H.264 at the same bandwidth [4] |
| Steadier on a weak link | Bad Link Mode; Smooth Display or Lowest Latency to taste [1] | Direct mode, or WebRTC with gop = 60 [2] | Medium to balance picture and bandwidth [4] |
| Readable BIOS text | Raise Quality briefly, then drop it back [1] | Raise kbps briefly [2] | High only on a fast connection [4] |
Questions before you decide
How much data does a remote KVM session use per hour?
It depends on the stream rate your settings produce, which the vendors do not publish as fixed numbers. The arithmetic is fixed: 1 Mbps for an hour is 450 MB, so 2 Mbps is about 900 MB and 4 Mbps about 1.8 GB. Measure the real rate with your phone's data counter over ten minutes.
Which Comet Pro settings use the least bandwidth?
GL.iNet's console guide says Smart mode reduces bandwidth for weak networks, and the Quality setting runs from Auto through Low, Medium, High, Ultra-high and Lossless. WebRTC (FEC) adds 5% to 20% redundancy, so pick plain WebRTC or a low FEC ratio when data is limited.
Is 4K remote control realistic?
PiKVM's FAQ says 4K real-time video will not fit through the network anyway, and that its CSI capture bridge cannot carry more than 1080p50. Plan remote sessions around 1080p or lower.
What should I change when the connection is laggy rather than slow?
On PiKVM, the video docs suggest H.264 gop = 60 for WebRTC on a bad network, or switching to Direct mode, which they describe as very stable on poor networks. On Comet Pro, try Latency Mode and Bad Link Mode, which stops keys sticking or repeating.
Sources & verification
Product details and prices can change. Check the linked provider before buying.
- GL.iNet KVM Docs: Comet Pro (GL-RM10) console guide Accessed 30 Oct 2026
- PiKVM Handbook: Video modes Accessed 30 Oct 2026
- PiKVM Handbook: FAQ Accessed 30 Oct 2026
- JetKVM Docs: Video settings Accessed 30 Oct 2026
- Apple Support: Connect to the Personal Hotspot of an iPhone or iPad Accessed 30 Oct 2026
Sources link directly to providers. Product buttons may use separately labeled affiliate links. Read our disclosure.