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[Solved] TP-Link TL-WR940N Router: Achieving Promised 450Mbps Speed with 300Mbps Optical Fiber

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  • #1 16952811
    effic
    Level 4  
    Posts: 35
    Rate: 1
    Hello, I have a question about my router. Today I have a 300Mbps optical fiber. I bought this router especially so that I could use Wi-Fi with at least 200 Mbit (The packaging from the router says that the speed is 450 Mbps). After connecting, I have 90 Mbps on wi-fi. And now the question is whether this is the fault of the company that provides me with the Internet, or maybe this router does not really reach this speed of up to 450Mbps. (I have a good wi-fi network card in my computer for usb up to 300Mbps).
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  • #2 16952820
    matek451
    Level 43  
    Posts: 31046
    Help: 4313
    Rate: 5707
    Card in full N, router with 450Mb / s LAN / WAN 100Mb / s and at 2.4GHz 90Mb / s speed, which is all right and even very good.
    Helpful post? Buy me a coffee.
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  • #3 16952833
    effic
    Level 4  
    Posts: 35
    Rate: 1
    matek451 wrote:
    Card in full N, router with 450Mb / s LAN / WAN 100Mb / s and at 2.4GHz 90Mb / s speed, which is all right and even very good.


    So it's the supplier's fault? Is everything ok with the router? The WAN port somehow does not limit the speed I should have (300Mbps)?
  • #4 16952876
    matek451
    Level 43  
    Posts: 31046
    Help: 4313
    Rate: 5707
    No, the provider gives 200Mb / s but the router has a WAN of 100Mb / s. It is good but not for this link, needed with the 1Gb / s switch. It is this port that determines the speed also after WiFi. When it comes to WiFi, on the 300Mb / s N card you will achieve a maximum of about 100-120Mb / s, on a 450Mb / s router maybe around 150Mb / s, but this is under ideal conditions and with a router. You want to have a certain 200MB / s, you buy a router with WAN, LAN 1GB / s and you connect the computer with a LAN cable.
    Helpful post? Buy me a coffee.
  • #5 16952889
    jprzedworski
    Network and Internet specialist  
    Posts: 5352
    Help: 757
    Rate: 824
    Overall, it's probably one of the better routers, but:
    effic wrote:
    The WAN port somehow does not limit the speed I should have (300Mbps)?
    It limits because it is only 100 Mb / s. However, the 450 or 300 Mb / s for Wi-Fi is still unattainable. In practice, up to 30-40% of this is achieved, so with this card it will be something like 100 Mb / s
  • #6 16952912
    Gatki
    Level 12  
    Posts: 102
    Rate: 31
    As for WiFi, I can add something like this:

    rt-ac1200g +

    2.4GHz: approx. 2m
    DL "201.01" UL "158.60"
    DL "213.71" UL "159.64"

    5GHz: approx. 2m
    DL "357.74" UL "221.03"
    DL "349.84" UL "221.56"

    INTEL(R) DUAL BAND WIRELESS-AC 7265
  • #7 16952927
    effic
    Level 4  
    Posts: 35
    Rate: 1
    jprzedworski wrote:
    Overall, it's probably one of the better routers, but:
    effic wrote:
    The WAN port somehow does not limit the speed I should have (300Mbps)?
    It limits because it is only 100 Mb / s. However, the 450 or 300 Mb / s for Wi-Fi is still unattainable. In practice, up to 30-40% of this is achieved, so with this card it will be something like 100 Mb / s


    And if I just bought a router with a faster WAN? Would it then be faster? And how could someone give me a suggestion of a good router with some faster WAN? It's best that I could buy such a router from a stationary saturn store, because I wanted to take it home for a test, and if it would work with higher speed, I would leave it for myself. (I mainly want the WI-FI to be as fast as possible because the router is in such a place that it would be difficult for me to connect to the computer with a cable.)
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  • #8 16953009
    jprzedworski
    Network and Internet specialist  
    Posts: 5352
    Help: 757
    Rate: 824
    effic wrote:
    I mainly want this WI-FI to be as fast as possible because the router is in such a place that it would be difficult for me to connect to the computer with a cable
    Real 200-300 Mb / s? It must be a router with Wi-Fi in the 2.4 / 5 GHz aa standard, but then the network card must be ac. Also remember that walls will be a problem, because the 5 GHz band passes through walls and other obstacles much worse. The WAN entry alone will not do the trick.
  • #9 16953052
    matek451
    Level 43  
    Posts: 31046
    Help: 4313
    Rate: 5707
    How much will you achieve with the N300Mb / s card has already been written on the computer. A router with a Gigabit switch will not change that. A question about the budget? the mentioned Asus AC-1200 is 250-300 PLN. in general, it pays to buy equipment with 1Gb / s and WiFi in AC.
    Helpful post? Buy me a coffee.
  • #10 16953100
    effic
    Level 4  
    Posts: 35
    Rate: 1
    jprzedworski wrote:
    effic wrote:
    I mainly want this WI-FI to be as fast as possible because the router is in such a place that it would be difficult for me to connect to the computer with a cable
    Real 200-300 Mb / s? It must be a router with Wi-Fi in the 2.4 / 5 GHz aa standard, but then the network card must be ac. Also remember that walls will be a problem, because the 5 GHz band passes through walls and other obstacles much worse. The WAN entry alone will not do the trick.


    How would I have these devices? Router -> https://www.morele.net/router-tp-link-archer-c1200-1020021/ Wi-Fi card -> https://www.morele.net/karta-sieciowa-tp-link -ac600-archer-t2uh-701788 /. It would be better?
  • #11 16953126
    matek451
    Level 43  
    Posts: 31046
    Help: 4313
    Rate: 5707
    Router OK but card is only 600Mbps AC, mainly based on 5GHz. It is difficult to judge how it will match you with the router and whether it will give 200Mb / s WiFi. I have an AC 1200 router with Gigabit, but I connect all devices that require high speed and gigabit LAN cards with a cable. After LAN, I calmly pull 600-700Mb / s in communication between these devices. And I use WiFi for mobile and laptop, although the house and neighbors are about 10m away from it, so the air is clean.
    Helpful post? Buy me a coffee.
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  • #13 17375589
    effic
    Level 4  
    Posts: 35
    Rate: 1
    Solved this case, so the problems were 2 one is a router that should be 5GHz with a WAN input of 1000mbps. The second thing is a damaged twisted pair cable. After the replacement, everything worked fine.
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Topic summary

✨ The discussion revolves around the performance of the TP-Link TL-WR940N router in conjunction with a 300Mbps optical fiber connection. The user initially experiences only 90Mbps on Wi-Fi, raising questions about whether the issue lies with the internet service provider or the router's capabilities. Responses clarify that the router's WAN port is limited to 100Mbps, which restricts overall speed, and that the theoretical Wi-Fi speeds (450Mbps) are often not achievable in practice, typically yielding around 100-150Mbps under ideal conditions. Suggestions include upgrading to a router with a Gigabit WAN port and using a compatible Wi-Fi card to achieve higher speeds. The user ultimately resolves the issue by replacing the router with a 5GHz model and fixing a damaged cable, resulting in improved performance.
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FAQ

TL;DR: TL-WR940N’s 100 Mb/s WAN means real Wi‑Fi around 90–120 Mb/s; “It is this port that determines the speed also after WiFi.” Upgrade to a Gigabit, dual‑band AC router and fix any bad cabling to reach 200–300 Mb/s. [Elektroda, matek451, post #16952876]

Quick Facts

Why do I only get ~90 Mb/s on TL‑WR940N with 300 Mb/s fiber?

Because the router’s WAN/LAN are 100 Mb/s and it runs 2.4 GHz N. That combination commonly yields ~90 Mb/s over Wi‑Fi. Your ISP link can be faster, but the router becomes the bottleneck. This performance is considered normal for this model. [Elektroda, matek451, post #16952820]

Does the 100 Mb/s WAN port limit my Wi‑Fi speed?

Yes. The WAN port caps total throughput. As one expert notes, “It is this port that determines the speed also after WiFi.” Even perfect Wi‑Fi cannot exceed the 100 Mb/s WAN ceiling for internet traffic. Upgrade to a Gigabit WAN to remove that cap. [Elektroda, matek451, post #16952876]

Can Wi‑Fi ever reach the advertised 450 Mb/s on this router?

No. 450 Mb/s is a PHY rate under ideal lab conditions. Real throughput is typically 30–40% of that due to protocol overhead and interference. Expect about 100 Mb/s with N‑class clients on 2.4 GHz in real homes. [Elektroda, jprzedworski, post #16952889]

What do I need to truly see 200–300 Mb/s over Wi‑Fi?

Use a dual‑band 802.11ac (5 GHz) router with Gigabit WAN and a matching ac‑capable client. 5 GHz delivers higher peak rates but loses more through walls, so keep distances short and line‑of‑sight when possible. [Elektroda, jprzedworski, post #16953009]

Will a Gigabit router help if my PC has only an N300 Wi‑Fi adapter?

Not much. An N300 adapter typically tops out near 100–120 Mb/s in practice. Upgrading the router alone will not bypass the client’s wireless limit. For higher speeds, upgrade the client to an ac adapter or use Ethernet. [Elektroda, matek451, post #16953052]

2.4 GHz vs 5 GHz: which should I use for speed?

Use 5 GHz for higher throughput and lower congestion. However, 5 GHz attenuates more through walls, so plan for shorter range and careful placement. Use 2.4 GHz when you need better penetration at the cost of speed. [Elektroda, jprzedworski, post #16953009]

What real‑world speeds did users report on AC1200 at close range?

One user measured about 350 Mb/s down and 220 Mb/s up over 5 GHz at ~2 meters using an Intel AC7265 client. This shows what a midrange AC1200 setup can deliver under favorable conditions. [Elektroda, Gatki, post #16952912]

Which USB Wi‑Fi adapter pairs well with an AC router for 200 Mb/s+?

A TP‑Link Archer T4UH (AC1300) was recommended, but it requires USB 3.0 for best performance. On USB 2.0, throughput can bottleneck. Match the adapter and port to avoid artificial caps. [Elektroda, jprzedworski, post #16953168]

Is an Archer C1200 plus an AC600 adapter enough for 200 Mb/s?

The router is fine, but AC600 can be marginal. It relies on 5 GHz and may not consistently hit 200 Mb/s depending on environment and drivers. Consider AC1200‑class adapters for more headroom. [Elektroda, matek451, post #16953126]

How do I troubleshoot low Wi‑Fi speed on a 300 Mb/s line?

  1. Verify router specs: ensure Gigabit WAN and 5 GHz support.
  2. Test with a wired PC; replace any suspect Ethernet patch cable.
  3. Re‑test on 5 GHz near the router with an ac‑class client. A bad cable plus a Fast‑Ethernet router caused the slowdown in this case. [Elektroda, effic, post #17375589]

Can a damaged Ethernet cable really cut my speeds?

Yes. A faulty twisted‑pair cable can force link renegotiation or high error rates, slashing throughput. Replacing a damaged cable restored full performance for the original poster after upgrading the router. Always test with a known‑good Cat5e or better patch lead. [Elektroda, effic, post #17375589]

Is Wi‑Fi good enough if I can’t run Ethernet to my PC?

It can be, with an ac‑class router and client on 5 GHz. For sustained high bitrates or local transfers, Ethernet still wins. Many power users wire bandwidth‑hungry devices and use Wi‑Fi for mobile gear. [Elektroda, matek451, post #16953052]

What does 802.11ac (AC1200) actually mean?

802.11ac is a 5 GHz standard that enables higher throughput than 802.11n. AC1200 indicates combined theoretical rates across bands, not real download speed. To benefit, both router and client must support ac. [Elektroda, jprzedworski, post #16953009]

Will switching to a Gigabit, dual‑band router fix everything by itself?

It removes the 100 Mb/s WAN bottleneck, but client radios, interference, and cabling still matter. Pair with an ac client and good cables. As the expert said, upgrade both sides for reliable 200 Mb/s+. [Elektroda, matek451, post #16952876]
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