Laptop wireless connection SLOW with network accounting system.

Very simple, text based, accounting system, written in BASIS ("business") Basic, BBx, Visual PRO/5.
(Server, if you will, based, with my computer <XP, Intel E4300, 2 GB RAM>, a bit dated but acceptable, being the server. Connected machines are essentially "dumb terminals" (to the accounting system).)


First (now second, 1st returned) Win8 machine.
All others that connect to the accounting system are mostly XP (desktops), or Win7 (laptops).

The Win7 machine, an older Dell laptop, which is the one to be replaced by this Win8 Dell laptop, works fine - wirelessly.

Any other laptops that were ever brought in & connected to the network (LAN) accounting system, have worked fine.

My brothers Lenovo, Yagi or something or the other, Win8, works fine (though there was 1 time where it too went SLOW).



1st:
Inspiron 15 5000 Series, Inspiron ####, Win 8.1 (64Bit)
4th Generation Intel(R) Core(TM) i3-4030U processor (3M Cache, 1.9 GHz)
1000GB HDD, 4 GB RAM
Intel(R) HD Graphics

2nd:
Inspiron 15 5000 Series, Inspiron 5547, Win 8.1 (64Bit)
4th Generation Intel(R) Core(TM) i3-4030U processor (3M Cache, 1.9 GHz)
500GB HDD, 6 GB RAM
Intel(R) HD Graphics


I'm on my second Dell laptop now.
(Earlier one, while also an Inspiron 15 5000 series, was different; battery, DVD, bottom case design, wireless card...)
(Earlier was returned for this very reason. At first Dell was going to send, supposedly, a different wireless card for me to try, but then they changed their story & wanted me to ship, a brand new computer back to "depot". So I just returned it & got this other one, because it had a different wireless card & hoping that the different card would act differently. It does not.)

Two different wireless cards.

1st was a 1507 1705.
2nd is an Intel Centrino Wireless-AC 3160


1st only connected 2.4 (SLOW).
2nd will connect with 2.4 or 5.0 (& both SLOW).


Wired works fine.
Wireless is SLOW, think 1200 baud modem, drawing the screen line by line.

Windows Safe Mode with Networking (heh) is nothing but BS, cause there is no network to be seen in Windows Safe Mode with Networking.

Removed McAfee.
Disabled (I believe) "Windows Defender" (aka some sort of A/V like thing, as it seems to be in Win8).

Reviewed (Device Manager) Wireless settings.
There are a ton, none of which are meaningful to me, so I just left it all as it was.

Updated (from Window Updates) the (Intel) wireless card driver.

Installed 44 or some such of the 90 or so Windows updates (this on a brand new machine, heh!).

Set System Properties | Settings -> Performance, to 'best performance'.

Reviewed/changed Power Options | Advanced settings, wireless, to no avail.

Plugged in or running on battery makes no difference.

Comcast ("business") Internet connection (& modem/router).

Internet connection speeds are not an issue.
Wire is a bit faster, lower ping times.
5.0 a bit slower, 2.4 a bit slower again, but fine.

AFAICT, network file transfers are also "*fine". 1st (returned) Dell only had 10/100 wired, & I'm guessing that is the same with this newer one too. ("*fine" in that because only 10/100, they are slow, & wireless, slower yet, but I'm suspecting nothing out of the ordinary in that regard.)



Ideas as to what else I can look at?