Wi-Fi on iMac much slower than iPhone

Further, on your iMac when it is connected to WiFi, Option-click the WiFi icon in the menu strip in the upper right of your desktop. You will get a dropdown box with a bunch of network information Pls. tell us what it says for:

• Channel
• RSSI
• Noise
• Tx Rate

Still in that same dropdown box, click Open Wireless Diagnostics. When the diagnostics window appears, DO NOT click Continue. Instead, in the menu strip (upper left of your desktop) click Window > Scan. Let the network scan run until it completes, then tell us the following:

• Best 2.4 GHz
• Best 5.0 GHz
• The number of networks that are using the same channel that your iMac reported in the dropdown box.

Then Quit Wireless Diagnostics.

For starters, we need to know the exact model iPhone & iMac. And assuming you are using WiFi, the make & model of your router/access point and how you have it set up, especially whether you are using 2.4 and/or 5.0 GHz bands and if you created a different network name (aka SSID) for each band.

Hi ColeNblaster,

If you've noticed issues when your Mac is connected to Wi-Fi, this resource has some information that could be helpful: Solve internet connection problems on Mac

If the issue continues, reach out to Apple Support directly so they can look into this with you further. They can be contacted here: Get Support or by calling the most applicable phone number from this list: Contact Apple for support and service.

Regards.