你有冇試過覺得上網好慢，但又唔確定係真係慢定係心理作用？又或者你啱啱裝咗新寬頻，想驗證下速度係咪達標？寬頻速度測試（speed test）就係你嘅最佳工具。但好多人做 speed test 嘅方法唔正確，導致結果唔準確。呢篇指南會教你點樣正確咁做速度測試，以及點樣理解測試結果。
Ever felt your internet was slow but weren't sure if it was actually underperforming? Or just installed new broadband and want to verify you're getting what you're paying for? A speed test is the answer. But many people test incorrectly, leading to misleading results. This guide covers how to test properly and how to interpret the numbers.
最佳速度測試工具 | Best Speed Test Tools
市面上有好多免費嘅速度測試工具，以下係最推薦嘅幾個：
1. Speedtest by Ookla (speedtest.net)
全球最多人用嘅速度測試工具。優點係測試伺服器多（包括香港本地伺服器），結果可靠，而且有手機 App 版本。網頁版同 App 版都免費，介面簡潔易用。你可以手動選擇測試伺服器，建議選擇你供應商喺香港嘅伺服器以取得最準確結果。
The world's most popular speed test. It has many test servers including local Hong Kong ones, reliable results, and a free mobile app. You can manually select a server — choose one from your ISP in Hong Kong for the most accurate results.
2. Fast.com (by Netflix)
由 Netflix 開發嘅速度測試工具，界面極度簡單——打開網頁就自動開始測試。佢主要測試下載速度，但按「顯示更多資訊」就可以睇到上載速度同延遲。因為佢用 Netflix 嘅伺服器測試，所以結果特別能反映你睇串流影片時嘅實際體驗。
Developed by Netflix with an ultra-simple interface — just open the page and it starts testing automatically. It primarily measures download speed, but click "Show more info" for upload and latency. Since it uses Netflix's servers, results closely reflect your streaming experience.
3. OFCA 官方速度測試 | OFCA Official Speed Test
香港通訊事務管理局辦公室（OFCA）提供嘅官方速度測試工具，網址係 speedtest.ofca.gov.hk。呢個工具嘅優勢係佢係本地政府機構營運，測試伺服器位於香港，對於向供應商投訴時最有說服力。如果你懷疑供應商冇提供承諾嘅速度，用 OFCA 嘅測試結果作為證據係最有效嘅。
The official speed test from Hong Kong's Office of the Communications Authority at speedtest.ofca.gov.hk. Its advantage is that it's run by a local government body with servers in Hong Kong, making results the most credible when filing complaints against your ISP.
點樣做先至準確？ | How to Get Accurate Results
Speed test 嘅結果好容易受外在因素影響。如果你想得到最準確嘅結果，必須注意以下幾點：
有線 vs 無線 | Wired vs WiFi
呢個係最重要嘅因素。如果你用 Wi-Fi 做速度測試，結果幾乎一定會比你嘅寬頻實際速度低。原因包括：Wi-Fi 訊號受牆壁阻隔、同頻道干擾（特別係 2.4GHz 頻段）、路由器性能限制等。
正確做法：用 LAN 線（Ethernet cable）直接連接電腦到路由器或 ONT（光纖終端設備），然後做測試。呢樣先可以測到你寬頻線路嘅真正速度，排除 Wi-Fi 嘅影響。
This is the single most important factor. WiFi speed tests will almost always show lower speeds than your actual broadband connection due to wall interference, channel congestion (especially on 2.4GHz), and router limitations. For accurate results, use an Ethernet cable to connect your computer directly to the router or ONT. This measures your actual broadband line speed without WiFi variables.
測試時間 | Time of Day
寬頻速度會隨時間波動。一般嚟講，繁忙時段（晚上 7 點至 11 點）係速度最慢嘅時候，因為同一區域嘅用戶同時上網。如果你要測試「最差情況」嘅速度，就揀呢個時段。如果你要測試線路嘅最高速度，就揀凌晨或上午非繁忙時段。
Broadband speeds fluctuate throughout the day. Peak hours (7 PM to 11 PM) typically see the slowest speeds as neighbours share bandwidth. Test during this window for "worst case" results. For maximum speed readings, test during off-peak hours (late night or morning). Ideally, test at multiple times for a complete picture.
關閉其他應用程式 | Close Other Applications
測試前，確保你嘅裝置冇其他嘢喺用緊網絡。以下係常見嘅「偷頻寬」元兇：
- 雲端同步服務（如 iCloud、Google Drive、Dropbox）
- 串流影片或音樂（Netflix、YouTube、Spotify）
- 系統更新（Windows Update、macOS 更新）
- 遊戲下載或更新
- 其他連接同一路由器嘅裝置（手機、平板、智能電視等）
Before testing, make sure nothing else is using your bandwidth. Common culprits include: cloud sync services (iCloud, Google Drive, Dropbox), streaming video/music, system updates (Windows Update, macOS), game downloads, and other devices connected to your router (phones, tablets, smart TVs). Ideally, disconnect all other devices from the network during testing.
多次測試取平均 | Run Multiple Tests
單次測試嘅結果可能受到瞬間網絡波動影響。建議做至少 3-5 次測試，每次之間隔幾分鐘，然後取平均值。如果某次結果同其他幾次差異好大，可以當作異常值排除。
A single test may be affected by momentary fluctuations. Run at least 3-5 tests with a few minutes between each, then average the results. Discard any obvious outliers.
理解測試結果 | Understanding Your Results
速度測試完成後，你會見到幾個數字。以下逐個解釋：
下載速度 Download Speed (Mbps)
下載速度係你從互聯網接收數據嘅速率，以 Mbps（Megabits per second，兆比特每秒）為單位。呢個係大部分人最關心嘅數字，因為日常上網活動（睇網頁、串流影片、下載檔案）主要依賴下載速度。
Download speed measures how fast you receive data from the internet, in Mbps (Megabits per second). This is the most important number for most users, as everyday activities (browsing, streaming, downloading) primarily rely on download speed.
上載速度 Upload Speed (Mbps)
上載速度係你向互聯網發送數據嘅速率。對於一般用戶，上載速度唔係咁重要，但如果你經常需要視像會議（Zoom、Teams）、上傳大型檔案、直播、或者喺屋企做雲端備份，上載速度就好重要。喺香港，光纖寬頻通常提供對稱速度（上下載一樣），但部分較低價計劃嘅上載速度可能只有下載速度嘅一半。
Upload speed measures how fast you send data. Less critical for casual users, but essential for video calls (Zoom, Teams), uploading large files, live streaming, or cloud backups. In Hong Kong, fibre broadband typically offers symmetric speeds (same up and down), though some budget plans may have lower upload speeds.
延遲 Ping / Latency (ms)
Ping（又稱延遲或 latency）係指數據由你嘅裝置傳送到測試伺服器再傳回嚟所需嘅時間，以毫秒（ms）為單位。數字越低越好。對於一般網頁瀏覽，Ping 唔係咁重要；但對於網絡遊戲、視像通話等即時互動嘅應用，低 Ping 值非常關鍵。
Ping (latency) measures the round-trip time for data to travel from your device to the test server and back, in milliseconds (ms). Lower is better. Not crucial for browsing, but vital for online gaming and video calls where real-time responsiveness matters.
參考值 Reference values：
- 1-10ms：極好（香港本地伺服器通常可以達到）| Excellent (typical for local HK servers)
- 10-30ms：好（亞洲區域伺服器）| Good (regional Asian servers)
- 30-80ms：可接受（到歐美伺服器）| Acceptable (to US/EU servers)
- 80ms 以上：可能會感覺到延遲（遊戲會有 lag）| Noticeable delay (gaming will lag)
抖動 Jitter (ms)
Jitter 係指 Ping 值嘅波動幅度。如果你嘅 Ping 一時係 5ms、一時係 50ms，Jitter 就好高。高 Jitter 會導致視像通話斷斷續續、網絡遊戲不穩定。理想嘅 Jitter 值應該低於 5ms。如果持續高於 10ms，可能代表你嘅網絡連線有穩定性問題。
Jitter measures the variation in ping times. If your ping jumps between 5ms and 50ms, jitter is high. High jitter causes choppy video calls and unstable gaming. Ideal jitter is below 5ms. Consistently above 10ms suggests a connection stability issue.
各速度級別預期表現 | Expected Speeds by Tier
供應商標示嘅係「最高速度」，實際速度通常會低一啲。以下係用有線連接測試時，各級別嘅合理預期：
Advertised speeds are maximums. Here are reasonable expectations when testing via wired connection:
500Mbps 計劃：預期實測 400-480 Mbps。低於 350 Mbps 應查詢供應商。
1000Mbps (1G) 計劃：預期實測 700-940 Mbps。低於 600 Mbps 唔正常。
2000Mbps (2G) 計劃：預期實測 1200-1800 Mbps（需要支援 2.5G 或 10G 嘅網卡同 LAN 線）。
100Mbps plan: Expect 80-95 Mbps. Below 70 is worth investigating.
500Mbps plan: Expect 400-480 Mbps. Below 350 warrants a call to your ISP.
1000Mbps (1G) plan: Expect 700-940 Mbps. Below 600 is abnormal.
2000Mbps (2G) plan: Expect 1200-1800 Mbps (requires 2.5G or 10G NIC and cable).
FTTH vs FTTB 嘅分別：如果你嘅大廈係 FTTH（光纖到戶），速度通常更接近標示速度。FTTB（光纖到大廈）因為最後一段用銅線，速度可能會有較大折損，特別係 1G 計劃可能只能達到 700-800 Mbps。
FTTH vs FTTB difference: FTTH (fibre to the home) buildings typically see speeds closer to the advertised maximum. FTTB (fibre to the building) uses copper for the final stretch, which can reduce speeds — especially for 1G plans, which may only achieve 700-800 Mbps.
幾時應該投訴供應商？ | When to Complain to Your ISP
如果你用有線連接做咗多次測試，結果持續低於預期，就應該聯絡供應商。以下係投訴嘅步驟：
1. 收集證據 — 喺唔同時間做多次測試，截圖記錄結果。最好同時用 Speedtest.net 同 OFCA 官方測試工具。記錄每次測試嘅日期、時間同結果。
2. 致電客服 — 向供應商報告問題。佢哋通常會先做遠端檢測，檢查你嘅線路狀態。
3. 要求上門檢查 — 如果遠端檢測解決唔到問題，要求安排技術人員上門檢查線路。
4. 向 OFCA 投訴 — 如果供應商未能解決問題或態度唔配合，你可以向通訊事務管理局辦公室（OFCA）提交投訴。OFCA 投訴熱線係 2961 6333，或者透過佢哋嘅網站提交。
5. 考慮轉台 — 如果問題長期未能解決，可能係你大廈嘅該供應商基建有根本性問題，轉台可能係最有效嘅解決方法。
If repeated wired tests consistently show speeds well below expectations, contact your ISP: (1) Gather evidence — run tests at different times, screenshot results from both Speedtest.net and OFCA's tool. (2) Call customer service — they'll usually run remote diagnostics. (3) Request on-site inspection if remote checks don't resolve it. (4) File a complaint with OFCA (hotline: 2961 6333) if the ISP is unresponsive. (5) Consider switching providers if the issue is a fundamental infrastructure problem in your building.
常見慢速原因 | Common Causes of Slow Speeds
如果你嘅速度測試結果唔理想，問題唔一定出喺供應商。以下係常見嘅慢速原因同解決方法：
1. Wi-Fi 問題 | WiFi Issues
呢個係最常見嘅原因。Wi-Fi 訊號受距離、牆壁、其他電子設備干擾等影響。解決方法包括：將路由器放喺家中中央位置、使用 5GHz 頻段而非 2.4GHz、升級到 Wi-Fi 6 路由器、或者使用 Mesh Wi-Fi 系統覆蓋較大嘅單位。
The most common cause. WiFi signals are affected by distance, walls, and interference from other electronics. Solutions: place the router centrally, use 5GHz instead of 2.4GHz, upgrade to a Wi-Fi 6 router, or use a mesh WiFi system for larger homes.
2. 路由器過時 | Outdated Router
如果你嘅路由器已經用咗 4-5 年以上，可能跟唔上你而家嘅寬頻速度。例如，舊款 Wi-Fi 4 (802.11n) 路由器嘅理論最高速度只有 300-450 Mbps，根本發揮唔到 1G 寬頻嘅速度。即使用有線連接，部分舊路由器嘅處理能力都可能成為瓶頸。
A router more than 4-5 years old may bottleneck your connection. Older Wi-Fi 4 (802.11n) routers max out at 300-450 Mbps theoretically and can't handle 1G broadband. Even wired, some older routers have limited processing power. Consider upgrading to a Wi-Fi 6 or Wi-Fi 6E router.
3. LAN 線材質素 | Ethernet Cable Quality
唔好忽視 LAN 線嘅重要性！如果你用緊舊嘅 Cat 5 線，最高只能支援 100Mbps。確保使用 Cat 5e（支援 1Gbps）或 Cat 6（支援 10Gbps）嘅網線。如果你用 2G 寬頻，更加需要 Cat 6 或以上。
Don't overlook cable quality. Old Cat 5 cables max out at 100Mbps. Ensure you're using Cat 5e (supports 1Gbps) or Cat 6 (supports 10Gbps). For 2G broadband, Cat 6 or above is essential.
4. 裝置性能限制 | Device Limitations
你部電腦或手機嘅網路卡（NIC）可能唔支援高速連接。例如，部分舊手提電腦只有 100Mbps 嘅 Ethernet 端口，做速度測試自然最高只有 100Mbps。檢查你裝置嘅網卡規格，確保佢支援 Gigabit Ethernet。
Your device's network adapter may be the bottleneck. Some older laptops only have 100Mbps Ethernet ports. Check your device's NIC specifications — it must support Gigabit Ethernet to test beyond 100Mbps.
5. 背景程式佔用頻寬 | Background Bandwidth Usage
即使你覺得自己冇做嘢，你嘅裝置可能喺背景進行系統更新、雲端同步、或者其他數據傳輸。Windows 嘅系統更新特別容易喺你唔知情嘅情況下佔用大量頻寬。
Even when you think you're idle, your device may be running system updates, cloud sync, or other data transfers in the background. Windows Update is particularly notorious for silently consuming bandwidth.
6. 大廈線路問題 | Building Wiring Issues
部分舊大廈嘅內部線路（特別係 FTTB 嘅銅線部分）可能老化或損壞，影響速度。如果你嘅鄰居都有同樣問題，可能需要向管理處反映，要求供應商更新大廈內部線路。
Internal wiring in older buildings (especially the copper portion in FTTB setups) may be degraded. If neighbours experience the same issue, report it to building management and request the ISP to upgrade internal cabling.
7. DNS 伺服器問題 | DNS Server Issues
DNS 唔會直接影響速度測試結果，但會影響你開網頁嘅速度。如果你覺得開網頁慢但速度測試正常，試下將 DNS 改為 Google DNS（8.8.8.8 / 8.8.4.4）或 Cloudflare DNS（1.1.1.1 / 1.0.0.1）。
DNS won't directly affect speed test results but does impact page loading times. If browsing feels slow despite good speed tests, try switching to Google DNS (8.8.8.8 / 8.8.4.4) or Cloudflare DNS (1.1.1.1 / 1.0.0.1).
速度測試 Checklist | Speed Test Checklist
測試前確認以下事項，確保結果最準確：
☑ 關閉所有其他應用程式 | Close all other applications
☑ 斷開其他裝置嘅網絡連接 | Disconnect other devices
☑ 確認 LAN 線係 Cat 5e 或以上 | Verify cable is Cat 5e or better
☑ 選擇香港本地嘅測試伺服器 | Select a local HK test server
☑ 做至少 3 次測試取平均值 | Run at least 3 tests and average
☑ 喺唔同時段測試 | Test at different times of day
☑ 記錄所有結果（截圖）| Screenshot and log all results
總結 | Summary
正確嘅速度測試可以幫你了解自己嘅寬頻是否物有所值。記住：用有線連接、關閉其他應用、多次測試取平均值。如果結果持續唔理想，先排除自己嘅設備同環境問題，再向供應商投訴。有 OFCA 嘅官方測試結果做後盾，你嘅投訴會更有說服力。
Proper speed testing helps you understand if you're getting what you pay for. Remember: use a wired connection, close other apps, and average multiple tests. If results are consistently poor, rule out your own equipment first, then contact your ISP. OFCA test results carry the most weight when filing formal complaints. Don't settle for poor performance — you deserve the speed you're paying for.