My phone gets around 400 Mbps on our 5 GHz Wi-Fi, but my PC can swing from a few Mbps to over 100 in the same room. One antenna on the PC is loose. What should I check first?
Why is my PC Wi-Fi so much slower than my phone?
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8P+Tasselby
Answers
Fix the loose antenna first. A poor antenna connection or awkward placement can weaken reception and make speeds jump around. Make sure both antennas are firmly attached and positioned as intended, then rerun the same speed test near the PC.
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Check the PC's Wi-Fi adapter and driver. The phone and PC may support different Wi-Fi capabilities even on the same band. Find the adapter model in your system settings or device manager, then install a current driver from the computer or adapter maker. Also check whether the PC is connecting to 5 GHz as expected.
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Try Ethernet if you can, even temporarily. If the wired speed is close to the phone's, that points toward the PC's Wi-Fi setup rather than the internet connection. If Ethernet is also slow, look at other PC or network settings.
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Test method matters too. Use the same speed-test service, choose the same nearby server, and run a few tests on each device close together. Pause downloads or updates on the PC while testing. One unusually low result does not tell you much by itself, but a repeated gap is worth troubleshooting.
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8P+Tasselby:
I'll check the adapter model and driver, then test again with the antenna tightened.