WiFi local network very slow loading

<<McAfee Security.>>

Running this package assume that somehow Apple is "holding out on you" and failing to provide a really easy solution that a third party, unfamiliar with the inner workings of MacOS, could easily provide to you with no impact on performance. All of that is wrong.

Your Mac already has the absolute best protection against arbitrary attack possible, and it is built deeply into MacOS.

You should NOT be running any third party Virus scanners. Nor cleaners, speeder-uppers or app-deleters. They are ALL Dreck. They make your Mac unstable and consume huge amounts of resources and make it crash at random, "to protect you".

Effective defenses against malware and ot… - Apple Community

.

In busy Network-neighborhoods, performance can be a problem once you get a connection.

To take a look at what is happening in your Network, Hold the Option key while you click on the Wifi icon on the menubar, and post a screen shot or transcribe the value shown. Like this older one:

Readers can take a look at how your connection is performing, and may be able to make some suggestions for speedup.

The 9,2 is a 13-in model from 2012, and has three antennas.

You have connected in the very interference prone 2.4GHz band, subject to competition from microwave ovens, baby monitors, certain cordless phone systems and many other devices. You are using 802.11n, which has only three clear channels in the band, {1, 6, 11} and the spectrum spills out onto adjacent channels.

You have good signal and low noise, for a signal-to-noise of 89-41 yields 48, excellent. You are suing three antennas to improve the baseband speed of 72M bits/sec to 195M bits/sec.

The only problem is that if one of your neighbors starts downloading a movie on a nearby channel, it could knock your transmit speed down a lot.

Someone nearby (you?) has an HP office jet printer set up as a base station, a "cute trick" that allows it to print direct from a phone. This is additional competition. If the printer were set up to be a station on a network, it would not complete and could likely still print from all devices just fine.

This is a "spectrum" display from Wi-Fi Explorer, an inexpensive Utility with a modest free trial. It illustrates how a nominal channel spills out onto adjacent channels:

This is an example of the SCAN display built into Wi-Fi diagnostics, that shows the nominal channels, but not the spillover:

.

Many printer makers seem to think its is a really "cute trick" to allow your phone to print directly to the Printer. To that end, their default is to turn the Printer into its own Base Station. In a crowded area, this mucks up the Wi-Fi for everyone, and does not work well, and does not allow printing from your Home Network.

So the biggest thing you have to overcome is the maker's zeal for this "cute trick" and set your printer up "the right way" so that it can be used by all devices on your Network.

to do this over Wi-Fi, the Printer needs to know three things:

1) what network-name is it supposed to join

2) what is the password to get on that network

3) how is it supposed to get an IP address (DHCP or manual at a specified address)

without all three of these, it can't join your home network, so it can't be 'discovered'.

There are basically two ways to get these into the Printer:

a) fat-finger it in through the printer's "front panel"

b) connect using a USB cable first, tell it the stuff, then disconnect the cable

There is one more way, but it is unbearably inconvenient. Leave the USB cable connected and the computer powered on at all times, and print over the network to a queue on the connected computer.

--------

In addition, the path of least resistance is to use the AirPrint Drivers. Again this is part of the cute trick of printing directly from your phone. The problem with that is you get NO Access to printer special features such as alternate paper sizes, two-sided printing, manual feed, and features you paid extra for.

You must take great care to select the driver intended for Network use, not the (Often default) AirPrint driver. The iPhone does not let you specify a drivers, so when using your iPhone, the AirPrint driver will be elected automatically. This does not present a conflict with using the regular driver from your Mac.