Open a command prompt and type in

netsh wlan show interface

Copy and paste the results in here.

I have used Draytek Routers for over a decade and they are pretty bullet proof. As you'll have seen from the WebGUI there is an overwhelming number of configuration options. Some of those to consider tinkering with is:

Turning off Band Steering to ensure you're connected to the 5GHz band.

In the General Setup for the 5Ghz band ensure you're on a channel that is not crowded and stick to channel 52 or lower to avoid the DFS radar scanning checks. Use a tool like WiFi Explorer or equivalent to discover local spectrum usage of neighbouring WiFi networks. Set the Radio Mode to Mixed to ensure 802.11ac is enabled.

In Advanced settings, switch to Green Field Mode, 20/40/80 Channel bandwidth, set TX power to 30%, enable WMM and change the country code to UK (assuming you live in the UK).

Run your tests again. If you can, use an end to end network performance tool called iPerf3 for testing. There are clients for all platforms including iOS and Android that you can use to test end to end performance. If you're a dab hand with Docker, pull and run a Container for Open Speed Test which is another simple LAN speed test tool.

https://forum.draytek.co.uk is a good place for specialised knowledge and Draytek UK support is responsive (they can be a bit teach you to suck eggs at first).

In reply to a post by Aferg1233:

I am transferring a test file, figures are from task manager and the file transfer screen.

Are you quoting MB/s figures or converting to Mb/s figures?

I have played with these settings with no change. I have just copied a file from the client to the server and am getting over 350mbps but then when trying to copy from the client to the server still only getting 50mbps?

I have factory reset the router and no bandwidth limits set etc and i have upgraded the firmware, i have just spoken to draytek support and they are going to try and replicate the issue in their lab.

Any suggestions?

Copying files as a test is relying on other technology layers like CIFS/SMB/NFS etc.

Try more basic TCP/IP throughput tests like iPerf3

In reply to a post by Aferg1233:

Any suggestions?

Have you checked what the wireless PHY link speed of your laptop adaptor is actually connecting to the AP at?

It *should* be stable connecting at 866/866 Mbps with >=99% signal rate (given you've said your're across the table from the AP) as reported under the W10 adapter settings (either method as noted above).

If its not then then you have a physical connectivity issue that needs sorting first and foremost.

[One of the many nice things on a Mac is the ability too get really good WiFi stats with one button press, but I digress]

The laptop shows as having 866mbps connection, i feel like there must be a config setting for this.

As i said when copying a file from my server it shows 50mbps but then when copying a file from laptop to the server it goes upto 250mbps.

Laptop

Accepted connection from 192.168.1.23, port 61089
[ 5] local 192.168.1.10 port 5201 connected to 192.168.1.23 port 61090
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 7.78 MBytes 65.2 Mbits/sec
[ 5] 1.00-2.00 sec 8.02 MBytes 67.4 Mbits/sec
[ 5] 2.00-3.00 sec 8.23 MBytes 69.0 Mbits/sec
[ 5] 3.00-4.00 sec 8.32 MBytes 69.8 Mbits/sec
[ 5] 4.00-5.00 sec 8.96 MBytes 75.1 Mbits/sec
[ 5] 5.00-6.00 sec 8.78 MBytes 73.7 Mbits/sec
[ 5] 6.00-7.00 sec 8.55 MBytes 71.7 Mbits/sec
[ 5] 7.00-8.00 sec 9.31 MBytes 78.1 Mbits/sec
[ 5] 8.00-9.00 sec 8.72 MBytes 73.2 Mbits/sec
[ 5] 9.00-10.00 sec 8.30 MBytes 69.6 Mbits/sec
[ 5] 10.00-10.06 sec 446 KBytes 63.3 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.06 sec 85.4 MBytes 71.2 Mbits/sec receiver

Server

Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.1.10, port 60247
[ 5] local 192.168.1.23 port 5201 connected to 192.168.1.10 port 60248
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 42.0 MBytes 351 Mbits/sec
[ 5] 1.00-2.00 sec 33.2 MBytes 279 Mbits/sec
[ 5] 2.00-3.00 sec 30.7 MBytes 257 Mbits/sec
[ 5] 3.00-4.00 sec 33.6 MBytes 282 Mbits/sec
[ 5] 4.00-5.00 sec 37.2 MBytes 311 Mbits/sec
[ 5] 5.00-6.00 sec 28.6 MBytes 240 Mbits/sec
[ 5] 6.00-7.00 sec 36.4 MBytes 305 Mbits/sec
[ 5] 7.00-8.00 sec 43.2 MBytes 362 Mbits/sec
[ 5] 8.00-9.00 sec 41.4 MBytes 347 Mbits/sec
[ 5] 9.00-10.00 sec 41.8 MBytes 351 Mbits/sec
[ 5] 10.00-10.04 sec 1.59 MBytes 360 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.04 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.04 sec 369 MBytes 309 Mbits/sec receiver
-----------------------------------------------------------
Server listening on 5201

https://imgur.com/a/Y2uwHCN

Grafana stats from send and receive....

Is the server another windows box or a NAS?

As noted above client server OS-based file transfer tests (because of the extra overhead/bloat) aren't always the best for consistent max network performance tests.

I would suggest you look at running the tests with a dedicated performance throughput tool as suggested like iperf, tamosoft or OpenSpeedtest