FAQ
TL;DR: After tuning Windows 10 and switching to 5 GHz, laptop Wi-Fi jumped from 20–40 Mbps to 140 Mbps; “speeds are OK” [Elektroda, matek451, post #19149426] Tests confirm 4-band LTE aggregation via Huawei B818 router [Elektroda, orilion, post #19182986]
Why it matters: Small software tweaks can unlock 3-7× faster wireless speeds without buying new hardware.
Quick Facts
• Huawei B818: LTE Cat 19, 1.6 Gbps DL / 150 Mbps UL (theoretical) [Huawei B818-263 Spec Sheet].
• Xiaomi Mi 9T Wi-Fi: 802.11ac 2×2 MIMO, 866 Mbps PHY [Xiaomi, 2019].
• TP-Link Archer T4U V3: 867 Mbps @ 5 GHz, 400 Mbps @ 2.4 GHz [TP-Link, 2020].
• Windows 10 reserves up to 20 % bandwidth for QoS; editable via Group Policy [Microsoft Docs, 2021].
• Safe-Mode test reached 100 Mbps vs 40 Mbps normal, flagging software bottlenecks [Elektroda, orilion, post #19167272]
Why does my phone hit 100-160 Mbps, but my PC only 20-40 Mbps on the same Wi-Fi?
The laptop’s Qualcomm QCA9377 card is single-stream (1×1) and often links at 72 Mbps on 2.4 GHz, capping real throughput near 50 Mbps [Elektroda, cheetah, #19136794]. Your Mi 9T uses 2×2 MIMO on 5 GHz and therefore negotiates up to 866 Mbps, allowing 100 + Mbps downloads [Elektroda, orilion, post #19134823]
Does LTE band aggregation in Huawei B818 directly raise Wi-Fi speed?
Aggregation raises the WAN (cellular) side to ~200 Mbps+, but Wi-Fi stays limited by the client adaptor. The phone gained 140 Mbps after aggregation [Elektroda, orilion, post #19182986], while the PC stayed slow until software tweaks fixed it [Elektroda, orilion, post #19167866]
How do I confirm I’m actually on 5 GHz?
Open inSSIDer or Windows ‘Connection Properties’. Look for channel numbers ≥ 36 or frequency near 5 200 MHz. The forum screenshot shows 5 192 MHz when the phone used 5 GHz [Elektroda, orilion, post #19166028]
Which Windows 10 settings throttled the user’s throughput?
QoS scheduler, background app updates, and TCP autotuning were active. Disabling QoS and setting ‘autotuninglevel=normal’ raised speed from 40 Mbps to 80-100 Mbps [Elektroda, orilion, post #19167866]
How can I quickly reset the TCP/IP stack?
Run Command Prompt as Administrator and type:
- netsh winsock reset
- netsh int ip reset
- ipconfig /flushdns & restart
This restored stable speeds in the thread [Elektroda, KOCUREK1970, post #19167890]
Can an ISP limit computer traffic more than phone traffic?
Orange stated they do not differentiate devices [Elektroda, orilion, post #19141194] Speed gaps traced back to local Wi-Fi and Windows issues, not carrier throttling [Elektroda, matek451, post #19149426]
Is Archer T2U/T4U enough for 100 + Mbps?
Yes—both support 867 Mbps at 5 GHz (2×2 MIMO). However, ensure USB 3.0 port usage and 5 GHz connection; otherwise speeds stay below 100 Mbps [TP-Link, 2020].
Why did a direct Ethernet cable still show only 40 Mbps?
Background Windows services and QoS reservations limited throughput. Safe-Mode (minimal drivers) pushed cable speed to 100 Mbps, confirming software, not hardware, as the choke point [Elektroda, orilion, post #19167272]
How do I run Poland’s certified speed test?
Disconnect other devices, connect via cable, then visit https://cik.uke.gov.pl and start ‘Certyfikowany Mechanizm Pomiaru’ [Elektroda, cheetah, #19135639].
What happens if I stay on congested 2.4 GHz channels?
Edge-case: With −70 dBm signal and overlapping neighbors, 20 MHz channels drop PHY rates to 72 Mbps; real downloads fall under 40 Mbps [Elektroda, cheetah, #19142679].
Which external antenna improves LTE performance here?
Dual-polarised LTE 1800-2600 MHz panels (~9 dBi) mounted toward BTS Kościuszki can add 10-15 dB RSRP and 30-50 Mbps, according to local tests [Elektroda, matek451, post #19149426]
3-step: How did the user finally reach 140 Mbps on the laptop?
- Switch Wi-Fi to 5 GHz Auto channel [Elektroda, nomudrek, post #19166745]
- Disable QoS, background updates, and set autotuninglevel=normal [Elektroda, orilion, post #19167866]
- Reboot; re-test with Speedtest—result: 140 Mbps [Elektroda, orilion, post #19182986]
