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Two laptops with very different WIFI performance
Posted by: dmag
Date: December 18, 2020 03:05AM
Hi,

I have two mid-2012 MBPs.

A. i5, 16GB RAM, 1TB SSD, latest Catalina OS.
B. i7, 16GB RAM, 750GB HD, Mojave OS

We have lousy internet where I am; 50 mbps down and 5 mbps up is the ceiling.

All settings in "advanced" are identical in both, from what I can tell.

Tests:

WIFI:

i5 — 32.54 down, 4.65 up.
i7 — 3.87 down, 0.00 up

Ethernet:

i5 — 29.03 down, 4.80 up.
i7 — 32.94 down, 4.81 up.

Ran the internal diagnostics on both. The reports were identical, and referenced a crowded channel.

i5, running on a 5 ghz channel, and the i7 is on a 2.4 ghz channel.

There are an equal number of nearby users on each.

So, I'm confused.

I still don't see why the i7 is drawing almost nothing on the WIFI speed test, and is basically unusable.

Any thoughts are appreciated. Thanks!
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Re: Two laptops with very different WIFI performance
Posted by: GGD
Date: December 18, 2020 04:32AM
Quote
dmag
All settings in "advanced" are identical in both, from what I can tell.

Quote
dmag
i5, running on a 5 ghz channel, and the i7 is on a 2.4 ghz channel.

All is not identical. Can you switch the i7 to a 5ghz network? In my home I have separate SSIDs for the 5ghz and 2ghz networks to that I can explicitly choose the 5g for speed (but not distance).

Another variable might be Location, Location, Location....

Is the i5 closer to the WiFi access point? Or fewer walls/obstacles.
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Re: Two laptops with very different WIFI performance
Posted by: dmag
Date: December 18, 2020 04:37AM
Quote
GGD
Can you switch the i7 to a 5ghz network?

Is the i5 closer to the WiFi access point? Or fewer walls/obstacles.

Scanned for channels. Turns out both of them are alone on their respective channels. There are recommendations for moving them to better channels, and I'll look into that.

The two laptops are on my desk.

Thanks



Edited 1 time(s). Last edit at 12/18/2020 04:57AM by dmag.
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Re: Two laptops with very different WIFI performance
Posted by: fauch
Date: December 18, 2020 07:05AM
Based on the above info, it is likely that the 2.4 gHz network is at fault here. Or the wifi card is crappy. Try the laptop on a different router and see if it still gets bad results.

In general there is much more interference on 2.4 networks. To the point that they are almost unusable in many places.
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Re: Two laptops with very different WIFI performance
Posted by: rich in distress
Date: December 18, 2020 09:17AM
Wifi stats on a new user for the slow machine would be interesting.
Then, starting up on a temporary, external Catalina install.
This is, of course, based on my assumption that running outdated OS’ has jumped the shark.
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Re: Two laptops with very different WIFI performance
Posted by: mattkime
Date: December 18, 2020 09:28AM
hold down the option key while clicking on the wifi menu. share screenshots of what you see. There will be some useful debugging info.



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Re: Two laptops with very different WIFI performance
Posted by: FormerlySaleenl
Date: December 18, 2020 10:08AM
I *just* ran into this issue this morning! This solution shouldn't have made a difference but I went from 3.83 Mbps download to 200.3 Mbps.

Open Network Preferences and create a new location. Make sure all non-wifi interfaces are turned off for it. Save and select it. It should be faster now. FWIW, I also have an i7 MBP, but it's newer.

I hope this works for you!
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Re: Two laptops with very different WIFI performance
Posted by: C(-)ris
Date: December 18, 2020 01:48PM
Connect them both to the 5ghz network. Problem solved. You have too much interference on the 2.4ghz band.



C(-)ris
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Edited 1 time(s). Last edit at 12/18/2020 01:48PM by C(-)ris.
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Re: Two laptops with very different WIFI performance
Posted by: dmag
Date: December 18, 2020 03:31PM
Lots of good advice here. Thanks!

I tried to load up the IP to adjust the router and channel assignment, but it didn't let me in.

The ISP tech said one of their guys would call to follow up. I'll do it then.

I'll try the new user at the same time.

If nothing helps, maybe it is the card.

Weird though, it was rockin' at max levels two days ago, then flatlined yesterday.

I appreciate the tips.

I'll post screenshots later tonight.
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