Q: my internet is running really slowly

Have you done a speed test for your internet connection? That would at least tell you whether or not what the provider told you was correct. You can find various speed test tools via Google, and depending on who your internet provider is, they may have their own link to a speed test.

Cheers,

GB

A page will start to load, and then essentially freeze. It takes a minute or two for the page to completely load.

That is what you would see if your DNS numbers were messed up.

Non-responsive DNS server or invalid DNS configuration can cause long delay before webpages load - Apple Support

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Please restart your router and also your broadband device, if they're separate.

Is the iPhone slow when off Wi-Fi and connected to the cellular network?

Please click the link below, which leads to Google's home page. Does it load slowly or at normal speed?

http://74.125.28.103

I'm not at all sure that I know what your problem is. Some pages load slowly and others don't, on your Mac and on your phone, but not on your PC?

Please back up all data.

Unlock the Network preference pane, if necessary, by clicking the lock icon in the lower left corner and entering your password. Cllck Advanced, open the DNS tab, and change the server addresses to the following:

          8.8.8.8

          8.8.4.4

That's Google DNS. Click OK, then Apply.

In Safari, select

          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data

and confirm. If you’re using another browser, empty the cache. Test. Any difference?

Notes:

1. If you lose Internet access after making the above change to your network settings, delete the Google servers in the  Network preference pane, then select the TCP/IP tab and click Renew DHCP Lease. That should restore the original DNS settings; otherwise restore them yourself. Remember that you must click Apply in order for any changes to take effect.

2. I don't use Google DNS myself, though I have tested it, and I'm not recommending it or any other DNS provider; the server addresses are offered merely for testing purposes. There may be privacy and technical issues involved in using that service, which you should investigate personally before you decide whether to keep the settings. Other public DNS services exist.