Question

Getting 30 mbps download compared to 60 on other 3 laptops

Getting only 30 mbps download with on wifi with ASUS TP300LAlaptop (less than a year old) while 3 other laptops (all different makes) on the same network are getting 60 + mbps on wifi. The download speed is lower for 2.4 Hz vs. 5.2 GHz (30 vs. 10) It is the same max speed irrespective of whether one or multiple laptops are on the simultaneously on the network. The network card (b/g/n) supports speeds much higher than 100 mbps. I do get about 100 mbps through direct Ethernet connection. The upload speed is 10 mbps for all the 4 laptops.

Same difference whether using Ookla and Comcast Speed test.

Asus changed networking card and motherboard but it did not make any difference. They are offering to exchange the unit with a refurbished one.

I am not sure if exchanging will help. Any suggestions about what to do will be greatly appreciated. Thanks.

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Answer
So much ground to cover.

As you know WiFi speeds depend on both router and client working well together. I don't know if you recall the early days and "Pre-N" where things didn't work together. Who said your Asus would play well with all routers?

It's more complicated than it seems and no, changing the model for same model should result in same speeds. Changing router models is more likely to have an effect but will anyone tell you this?

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Getting 30 mbps download compared to 60 on other 3 laptops

R. Proffitt - Thanks for your response. I think you are more likely to be correct that it is indeed a Comcast supplied router-asus interface issue. I have tried on other network and the results don't change. I know if I use an external wireless dongle thru my usb, I do get 60 mbps on the same unit and direct Ethernet gives me about 100 mbps. In fact a few minutes after I disconnect the Ethernet, the speed is about 60 mbps and then drops again.

Few things are baffling. 1) 3 other laptops (one > 4 years old) routine gives 50 to 70 mbps 2) ASUS had this laptop 3 times and in spite of telling them repeatedly asking them to do, thyme have never checked the wifi speed at their facility. 3) why is there such a big difference between 2.4 GHz (10 mbps) and 5.2 GHz (30 mbps) 4) The Wifi status screen says that the speed is between 270 and 300 mbps. Is that what the device is seeing (I don't think so, but just putting it out).

The model is ASUS TP300LA with i5-4210U processor, 8 GB RAM and Intel AC7260 Dual Band wireless network adapter.

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remember

I wrote router code in the 90's so it's not such a mystery as I lived with WiFi and code since 802.11b days. For me, if I'm working with a client I carry out another router. Today I like to try the newer AC models if the laptops have AC. If not I set the router all the way back to 802.11n 20MHz OFDM so to avoid the router trying to negotiate 801.11n 40MHz over and over, failing as it goes.

I posted a longer IEEE link about more but this is simply an issue of client and router playing together. It may confuse folk why it works for a time at full speed but "code" can see it's having too many retries and fallback a notch.

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PS. Forgot a tool I use to check the area for interference.

I use an Android phone and Wifi Analyzer.

Post was last edited on November 5, 2015 12:43 PM PST

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Answer
Getting 30 mbps download compared to 60 on other 3

TCP/IP settings for both IPv4 and IPv6 (IP address and DNS) are set to automatic. I doo not know how to look into Fragmentation Threshold and Maximum Transmission Unit.

The wifi status screen gives the speed between 270 and 300 mbps. Both IPv4 and IPv6 connectivities are active.

When I looked into Properties on the wifi status screen and follow Configure and then Advanced, I see the following: Channel width 802.11n for both 2.4 and 5.2 GHz are set to auto (alternative is 20 MHz) and the Ad Hoc Channel Width for 802.11b/g was set to 1. I tried changing that to 6 and 11 but had no effect with download speed with testing with Ookla. It is still around 30 mbps. There are number of other settings and the only one that can be relevant is HT mode - which is set to VHT. All self diagnosis for the wifi status says that the wifi is working fine. I know if use an external wireless dongle thru mu usb, I do get 60 mbps on the same unit.

How does one replace the wireless access point? Is it built into the networking card or is it another hardware?

I am not sure changing the unit for a refurbished one will help.

Thanks.

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To get those high speeds

I usually have to get it all working in 802.11n 40MHz OFDM (mode.) You're at 20 MHz so what's that speed in the laboratory?

"an 802.11n network can achieve 72 megabits per second (on a single 20 MHz channel with one antenna and 400 ns guard interval); 802.11n's speed may go up to 150 megabits per second if there aren't other Bluetooth, microwave or WiFi emissions in the neighborhood by using two 20 MHz channels in 40 MHz mode."
https://en.wikipedia.org/wiki/IEEE_802.11n-2009

So given you don't have a clean laboratory setup, anything in the area can upset that and cause more guardtime or it is just a fine interplay of router and devices.

It's all very technical and consumers do not want to know what's going on. So if you find another model laptop that does the speed, you may want to change that. Here I've changed routers to fix such things.

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Follow-up

R. Proffitt - Thanks again for your response.

Channel width 802.11n for both 2.4 and 5.2 GHz are set to auto. I just now tried setting the 2.4 GHz to the alternative is 20 MHz and the download speed dropped to 2 mbps. I have also observed that the wifi speed on the 2.4 GHz supported laptops, the download speed can drop during heavy traffic times but the 5 GHz is more consistent around 25 to mbps. All these support what you wrote and what I can make out from the Wikipedia posting.

There are no Bluetooth or Microwave currently inside the house; just 0 to 2 other additional laptop depending on the time. There is unlikely to be much interference from the neighbors' networks.

Is the Ookla results detect or indicate a gig difference between 30 and 60 mbps?

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That only shows that router and client

Aren't working together well. As a network tech you would know to change to another router for testing as well as pulling out your WiFi Analyzer.

5GHz for now may be more consistent as there is not as much traffic in locations I've looked into over the years.

When testing for speed, ALL other devices must be off since one packet or sniff and it can cause the high speed train to stop. Windows Updates all the time so there's that and more.

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Follow up 2

R. Proffitt - Greatly appreciate your time in trying to assist me.

Firstly, I have no background on networking technology. I am just following instructions from you and what I read on the web. I have tried checking the speed at all times of the day and night - never getting anything above 30 mbps.

As I mentioned, I know the same unit can do better with an external wireless dongle to get 60 mbps on the same unit and direct Ethernet gives me about 100 mbps. ASUS has changed the Wireless Adpater and the Motherboard. Is this an antenna issue and changing it or any other part will fix the issue or 2) Or as you said this is simply an issue of client and router not playing together or not compatible?

By the way ASUS support is just horrible with no idea about simple technical issues and the repair center sent my laptop back 3 times without checking the wifi speed. Even the customer service notes about the repair and testing went unheeded by the repair group.

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I hear you.

And since Asus didn't broach the issues I brought up since, well, they're not there to teach and failed to well, explain how routers and clients and testing in a clean lab is so important. I don't expect most to get far along. Some even get agitated about it all and blow up.

My background includes writing router code, 2 way pager hardware and software and the list goes on. I wish the industry was perfect but it isn't so my friends in the biz have ways to handle such issues.

Can be really annoying to those that believe that all routers work at top speed with all clients and settings. I mean they should, right? (No.)

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