Download Speed Guide — What It Depends On, How to Measure It, and How to Speed It Up?
You're sitting in front of your computer, waiting for that 50 GB game, 4K movie, or important work file to finally download. The download bar is moving, but slowly — and you don't understand why. You're paying for an „up to 500 Mbps” subscription, yet it takes hours to download a single file. Sound familiar?
A download speed is the most critical metric of your internet connection for most users. Streaming, file downloads, loading websites, updates — all of these rely on download bandwidth. In this guide, you'll learn everything about it: what Mbps really means, why the advertised speed doesn't match the real speed, how to measure it accurately, and what you can specifically do to increase download speed .
What is download speed and why is it the most important metric?
Download speed (in English, download speed) shows how much data can travel from the internet to your device in one second. The data flow direction is from the server to your computer — this is the opposite of upload speed, where data goes from your device to the server.
Why is it the most important? Because 80-90% of everyday internet use is based on downloading:
- Video streaming (Netflix, YouTube, HBO Max) — continuous data flow from the server
- Loading websites — downloading images, scripts, fonts
- Downloading files, games, applications
- System updates (Windows, macOS, phone OSes)
- Cloud sync download direction (Google Drive, OneDrive, iCloud)
Upload speed (upload bandwidth) becomes critical when you are sending data: video calls, streaming (Twitch, YouTube Live), uploading large files, or remote work via VPN. Latency (ping) indicates response time — this matters for gaming and real-time communication.
In short: If you feel the internet is „slow,” 90% of the time download speed is the culprit.
The big misunderstanding: Mbps vs. MB/s (Megabit vs. Megabyte)
This is the most common cause of disappointment. Providers advertise speed in Mbps (Megabits per second). Your browser, Steam, and download managers show the download rate in MB/s (Megabytes per second).
The difference: 1 Byte = 8 bits. So the actual download speed in MB/s is roughly the Mbps value divided by 8 — but this is a theoretical maximum; in practice, 10-15% overhead (protocol headers, TCP/IP packets) results in even less.
Speed conversion table (theoretical maximum vs. practical average)
| Advertised speed (Mbps) | Theoretical max (MB/s) | Practical average (MB/s) | Downloading 1 GB (practical) | Downloading 10 GB (practical) | Downloading 50 GB (practical) |
|---|---|---|---|---|---|
| 100 Mbps | 5 MB/s | 10-11 MB/s | ~1.5-2 minutes | ~15-17 minutes | ~75-85 minutes |
| 300 Mbps | 5 MB/s | 30-33 MB/s | ~30-35 seconds | ~5-6 minutes | ~25-28 minutes |
| 500 Mbps | 5 MB/s | 50-55 MB/s | ~18-20 sec | ~3-3.5 min | ~15-17 minutes |
| 1000 Mbps (1 Gbps) | 125 MB/s | 95-110 MB/s | ~9-11 sec | ~1.5-2 minutes | ~7.5-9 min |
Note: Practical values assume a wired (Ethernet) connection, optimal router, and an unloaded server. On Wi-Fi, they may be 30-50% lower.
So if you have a 500 Mbps subscription, don't expect 62 MB/s — 50-55 MB/s is the realistic maximum. If you see 20-30 MB/s, that's normal, not a fault.
How does downloading work? The relationship between bandwidth and download speed
Imagine bandwidth as a water pipe. The pipe's diameter = bandwidth (Mbps). The thicker the pipe, the more water (data) flows through at once. The download speed is the actual flow rate of water at a given moment.
But — and this is key — you are not the only one connected to the end of the pipe.
Who shares the bandwidth in the household?
- Every device that is online (phones, laptops, TVs, consoles, smart devices)
- Every active application: streaming, downloading, updating, syncing
- Background processes you don't even see (Windows Update, Steam downloads, cloud sync)
If 500 Mbps is the pipe, and your wife is watching Netflix in 4K (~25 Mbps), your child is gaming online (~3-5 Mbps), your phone is syncing photos (~10-20 Mbps), then the remaining bandwidth from which you can you download is only ~450 Mbps — and that's without peak-time network congestion.
What affects download speed? The main factors
Provider technology (FTTH vs. Coax vs. DSL vs. Mobile)
The internet access technology determines the maximum download speed and stability the most:
| Technology | Typical download speed | Stability | Latency (ping) |
|---|---|---|---|
| FTTH (Fiber to the Home) | 300-1000+ Mbps | Excellent | 2-8 ms |
| FTTC (Fiber to the Curb, then coax/copper) | 100-500 Mbps | Good | 5-15 ms |
| DOCSIS 3.1 (Cable, coax) | 300-1000 Mbps | Moderate (congested during peak hours) | 8-20 ms |
| VDSL/VDSL2 (Copper) | 30-250 Mbps | Distance-dependent | 10-30 ms |
| 4G/LTE (Mobile) | 20-300 Mbps | Variable (load, signal) | 20-50 ms |
| 5G (Mobile Network) | 100-1000+ Mbps | Good (if coverage is available) | 10-25 ms |
FTTH (Fiber To The Home) the most reliable: the fiber optic cable goes all the way into your home, no „last mile” loss over copper. If you have the option, choose this.
Network devices: router, switch, network card
Even the fastest fiber optic subscription is useless if your internal network is a „bottleneck”.
- Router: A 5-year-old Wi-Fi 4 (802.11n) router can handle a maximum of ~150-300 Mbps over Wi-Fi, and its wired ports are often only 100 Mbps. Minimum Wi-Fi 5 (802.11ac), recommended Wi-Fi 6/6E/7 router For 500 Mbps+ packages.
- Ethernet ports: Gigabit (1 Gbps) ports minimum. 2.5 Gbps or 10 Gbps ports future-proof.
- Network Interface Card (NIC): Older laptops often only have a 100 Mbps LAN port or a Wi-Fi 4/5 card. A USB Wi-Fi 6 adapter ($15-30) or PCIe card solves this.
- Switch: If you use a switch, it should also be at least Gigabit.
Wi-Fi vs. Wired Connection — the biggest difference
This is not marketing: Ethernet cable is always faster, more stable, with lower ping, than any Wi-Fi.
- Wi-Fi 5 (802.11ac): 300-600 Mbps in practice on 5 GHz (theoretical: 866-1733 Mbps)
- Wi-Fi 6 (802.11ax): 600-900 Mbps in practice on 5 GHz
- Wi-Fi 6E / 7 (6 GHz band): 800-1500+ Mbps in practice, but only with compatible devices
- CAT6/CAT6a cable: 1 Gbps (CAT6) or 10 Gbps (CAT6a) guaranteed, stable, no interference
Rule: If you are measuring download speed or downloading a large file, connect via cable. Wi-Fi is convenient, but cable provides the speed test results (and large downloads).
Background processes — the invisible bandwidth hogs
These are the most commonly overlooked factors:
- Windows Update / macOS updates: Downloading GBs of data in the background
- Steam / Epic / GOG automatic updates: Games update while you do other things
- Cloud sync: OneDrive, Google Drive, Dropbox, iCloud — constantly syncing
- Torrent clients: Even if you are „just seeding,” uploading consumes bandwidth, which slows down downloads due to TCP ACK packets
- VPN: Encryption overhead + a farther server = 10-30% speed loss
- Antivirus / firewall: Some security software performs deep packet inspection, which becomes CPU-bound and slows down the network
Remote server limitations — it's useless to have 1 Gbps if the server gives 10 Mbps
This is the least known but most important factor for large files. Download speed always the slowest link will be.
- A small file-sharing site (e.g., old forum attachments): often 1-5 Mbps limit
- Steam / Epic / GOG / Battle.net: their own CDNs, usually 100-500+ Mbps (if there's a server in your region)
- Microsoft / Apple / Google update servers: very fast, often serve the full bandwidth
- Torrent: depends on the number and bandwidth of seeders
- Other download sites: often intentionally limit free users (1-10 Mbps)
Test: If speedtest365.hu shows 900 Mbps, but Steam downloads a game at 50 Mbps, your provider is not the culprit — the Steam server (or the CDN node you're directed to) is the bottleneck.
How to accurately measure download speed? (Step by step)
For accurate measurement, follow this checklist. Every point matters.
- Connect with a cable (Ethernet) to the router. Wi-Fi measurement never gives the real maximum of the connection.
- Stop ALL background processes. Close the browser (except the measurement page), Steam, Epic, torrent clients, cloud sync, Windows Update, VPN.
- Turn off VPN and proxy. These add extra hops and encryption overhead.
- Choose the nearest, least loaded measurement server. speedtest365.hu automatically selects the best Hungarian server.
- Measure at least 3 times and calculate the average. A single measurement can be skewed.
- Measure at different times of day. Peak hours (18-22) are usually 20-40% slower.
- Note: download speed, upload speed, ping, jitter.
Pro tip: Before measuring, restart the router and ONT/modem — often brings a 5-15% improvement.
Increasing download speed — Practical tips for speeding up
If your measurement is lower than expected, here are effective steps:
Switch to a wired connection
If you measure on WiFi and get 200 Mbps on a 500 Mbps plan, plugging a CAT6 cable into the router can immediately bring 450-480 Mbps.
Router restart and firmware update
Restart the router once a week. Update the firmware.
Wi-Fi channel and band optimization
Use the 5 GHz band, Wi-Fi analyzer app, Band Steering and MU-MIMO options.
DNS server change
Cloudflare (1.1.1.1), Google (8.8.8.8), or Quad9 (9.9.9.9).
QoS setup in the router
Ensures that important traffic gets the bandwidth.
Update network card drivers
Replace Ethernet cable
Old CAT5 cable = max 100 Mbps. CAT5e = 1 Gbps. CAT6 = 1-10 Gbps.
Upgrade your provider plan
Frequently Asked Questions (FAQ)
Why is download speed slower in the evening?
Between 18-22 in the evening, most people use the internet: network congestion. Normal up to a 10-30% decrease.
How much speed is needed for 4K streaming / gaming / home office?
- 4K streaming: 25 Mbps / stream
- Online gaming: 3-5 Mbps, but ping < 50 ms and jitter < 10 ms needed
- Home office: 10-20 Mbps down / 5-10 Mbps up
- Large files: 200+ Mbps recommended
Why does speedtest365.hu show a different value than other tests?
Every test measures against a different server, using a different protocol. speedtest365.hu measures with Hungarian servers, thus providing the most accurate domestic connection.
Summary — 5 golden rules
- Measure with a cable. Wi-Fi measurement = error.
- Understand the difference between Mbps vs. MB/s.
- Clear the background.
- The slowest link matters.
- Don't accept slow internet.
Last updated: July 2026 | This article is part of the speedtest365.hu expert knowledge base.