TP LINK Deco M4 wifi speeds slow

[JINNY2]

I have a problem with the TP LINK deco M4 on a 1gbp plan for Wifi

See tests:

• HUB4 (Modem Mode) > Laptop (Ethernet) 900mb download speed
• HUB4 (Modem Mode) > Deco > Laptop (Ethernet) 900mb download speed
• HUB4 (Modem Mode) > Deco > Laptop (Wifi 5ghz) 300mb download speed

I then tried reverting HUB4 in router mode and disabling the deco.

• HUB4 (Router Mode) > Laptop (Ethernet) 900mb download speed
• HUB4 (Router Mode) > Laptop (5ghz Wifi) 300mb download speed

On the hub 3 i was getting 350mb on a 350mb plan, so cant figure out my deco is not providing this on laptop via wifi.

Laptop specs:
https://www.europc.co.uk/dell-xps-13-9370-intel-core-i5-8250u-8gb-ram-256gb-ssd-13-3-1920x1080-fhd-d...

The wifi is ac and is capable of handling up to 900mb
These devices all received sub 300mb download speeds

• Dell XPS
• Samsung 20 Ultra
• Samsung s10+ 
  
  Any advice on improving wifi speed on deco?

[JINNY2]

Update post fitting attenuator : Still no improvement on speeds on device

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

30	402750000	6.000000	40.366287	QAM256	30
1	138750000	7.300003	40.366287	QAM256	1
2	146750000	7.500000	40.366287	QAM256	2
3	154750000	7.300003	38.983261	QAM256	3
4	162750000	6.500000	38.983261	QAM256	4
5	170750000	5.900002	40.366287	QAM256	5
6	178750000	5.599998	40.366287	QAM256	6
7	186750000	5.699997	40.366287	QAM256	7
8	194750000	5.400002	40.366287	QAM256	8
9	202750000	5.099998	40.366287	QAM256	9
10	210750000	5.000000	40.366287	QAM256	10
11	218750000	5.000000	40.366287	QAM256	11
12	226750000	5.199997	40.366287	QAM256	12
13	234750000	5.300003	40.366287	QAM256	13
14	242750000	5.400002	40.366287	QAM256	14
15	250750000	5.300003	40.366287	QAM256	15
16	258750000	5.400002	40.366287	QAM256	16
17	266750000	5.000000	40.366287	QAM256	17
18	274750000	5.900002	40.946209	QAM256	18
19	282750000	7.199997	40.366287	QAM256	19
20	290750000	7.599998	40.946209	QAM256	20
21	298750000	7.699997	40.946209	QAM256	21
22	306750000	7.500000	40.366287	QAM256	22
23	314750000	7.300003	40.366287	QAM256	23
24	322750000	7.300003	40.366287	QAM256	24
25	330750000	7.300003	40.366287	QAM256	25
26	370750000	7.699997	40.946209	QAM256	26
27	378750000	7.800003	40.366287	QAM256	27
28	386750000	7.599998	40.946209	QAM256	28
29	394750000	6.599998	40.366287	QAM256	29
31	410750000	6.599998	40.366287	QAM256	31

3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

30	Locked	40.366287	0	0
1	Locked	40.366287	0	0
2	Locked	40.366287	0	0
3	Locked	38.983261	0	0
4	Locked	38.983261	0	0
5	Locked	40.366287	0	0
6	Locked	40.366287	0	0
7	Locked	40.366287	0	0
8	Locked	40.366287	0	0
9	Locked	40.366287	0	0
10	Locked	40.366287	0	0
11	Locked	40.366287	0	0
12	Locked	40.366287	0	0
13	Locked	40.366287	0	0
14	Locked	40.366287	0	0
15	Locked	40.366287	0	0
16	Locked	40.366287	0	0
17	Locked	40.366287	0	0
18	Locked	40.946209	0	0
19	Locked	40.366287	0	0
20	Locked	40.946209	0	0
21	Locked	40.946209	0	0
22	Locked	40.366287	0	0
23	Locked	40.366287	0	0
24	Locked	40.366287	0	0
25	Locked	40.366287	0	0
26	Locked	40.946209	0	0
27	Locked	40.366287	0	0
28	Locked	40.946209	0	0
29	Locked	40.366287	0	0
31	Locked	40.366287	0	0

3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

33

86

4K

1680

QAM4096

424

3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

33

Locked

43

8.0

4651015

0

[legacy1]

300Mb by wifi is good.

[JINNY2]

OK I just retested

The Ethernet speed on the HUB 4 is 800mb but the Ethernet speed from the deco M4 is 250mb
Wifi is also 250mb on main node