Hi guys, I’ve contacted the support team as well.
That’s their reply.

1. I have consulted our team about your question and got the most professional answer.Sorry to say that enabling Qos will absolutely make you get low speed.All of similar products in the market use not only the CPU but also some other chips to transmit data which are designed just for NAT function because is the most important function needed. Generally, products use all of them to provide us high speed .But Qos need all of data to be under the control of CPU so that the CPU can differentiate their priority.To make sure this, the Hardware NAT is turned off in advance automatically.So you are just receiving a speed of 40Mbps.By the way,while there are too many devices making your network crowd,our Qos will ensure the device with high priority have a good connection but while there are only a few devices,it will make no difference as all of the devices can surf online well.

2. I am sorry to say the bandwidth control is work on the v1 version of VR600 and it is replaced by Qos in v2.Your VR600 v2 is a high-end product, and Qos is also a higher function with the new technology. It is similar to bandwidth control, but it is more smart in distributing bandwidth to your devices when suffering from a network jam.

Hmmm nice to have answer from support but maybe my English is not advanced enough to fully understand. Do I get correctly that they basically say that CPU in router is slow and cant handle proper QoS beyond 40 Mbps bandwidth? Or is there any other meaning I am missing?

Anyway I contacted our local support and these guys asked me relevant questions, so hopefully they will find some answers...

Wlk wrote

Hmmm nice to have answer from support but maybe my English is not advanced enough to fully understand. Do I get correctly that they basically say that CPU in router is slow and cant handle proper QoS beyond 40 Mbps bandwidth? Or is there any other meaning I am missing?Anyway I contacted our local support and these guys asked me relevant questions, so hopefully they will find some answers...

I think that’s exactly what it means. Waiting for your answer.

Support answered me as well, but with a very different answer... but I don't think this will help me, because I already tried the proposed measure beforehand without result as far as I remember.

***

Why my download speed become slower after I enable Bandwidth Control?
Enabling Bandwidth Control feature would make total bandwidth 5% loss because of its own mechanism. And the bandwidth you setup on the manage page is measured by ADSL Speed. However, normally the speed you’ve used or tested on the computer is shown as Ethernet speed. And the relationship between them is: [Ethernet Speed] * 1.25= [ADSL Speed].

For example, the bandwidth offered by ISP, the speed shown by speedtest or downloadable software are all Ethernet speed. Current rate on our modem is Sync rate, which is a bit higher than the real bandwidth ISP provided. If ISP provides 4Mbps bandwidth, usually the modem is synced to higher than 4.5 Mbps, then the Ethernet speed with bandwidth control will be higher than 4.5 *0.8=3.6Mbps. So there will be about 400Kbps rate waste.

To solve this issue, there is also an "Other" option on Bandwidth Control page. The "Other" bandwidth control option means Ethernet speed. So we can choose "Other" and setup a suitable downstream rate to make full use of our Wide Band.

***

Tried DLS and Other, results are same. And I measured direct throughput on actual download app JDownloader in Windows, in MB/s (megabytes not megabits). I know limits of my line from previous modem, achieving same speeds (6,1 MB/s max). And It is almost halved when I enable QoS regardless of settings.

Waiting for response from CZ support.

New answer from support.. not very much, just the statement that they ""will continue to focus on that strange issue".

Interesting is the part in the answer where they stated (regarding the answer that kill3bill received from support that the V1 version is different from the V2 version) that V1 and V2
"they use the same model BCM chipset".

So it seems that there are different persons/teams in support on the same issue and everyone of them has different answers.. for now. ;)

Let's hope that they start to put the pieces together. :) :)

I'll keep you informed.

=\ I kinda already quit on the issue.. hopeless already.

kill3bill wrote

=\ I kinda already quit on the issue.. hopeless already.

Wel, I wouldn't quitting the issue so fast. Such changes take time as far as I've experienced myself. Maybe, just maybe we can hope for a fix in 2018. I never expected that this problem will be fixed within a few days.

Make sure the device doing speedtest is with the highest priority and disconnect all other devices, stop other applications when testing the speed.
Try at least 3 times in different at different times.
If the speed is always slow, contact TP-Link support for help. They may have some solution.

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malanies wrote

Make sure the device doing speedtest is with the highest priority and disconnect all other devices, stop other applications when testing the speed.
Try at least 3 times in different at different times.
If the speed is always slow, contact TP-Link support for help. They may have some solution.

Is this something like an automated answer?

We've gotten already FAR beyond that step, TP-Link has been contacted some time ago, several mails with checks, questions and answers have been exchanged......