My IPhone 14 Pro Max Wi-Fi works great after a reboot (500+ Mbps) but after a while, it slows to around 1 Mbps??

Hi Ford_Colorado,

Welcome to Apple Support Communities. Are you having any noticeable issues with internet speed aside from the numbers that you see or is the main concern the speed itself? Is this data coming from a third party app or where do you see that exactly? That may narrow this down a bit.

To isolate where this occurs, test on another network and see what happens there. If you use a VPN or security software try disabling that as well to make sure the issue isn't related.

We also recommend that you work through the guidance from If your iPhone or iPad won't connect to a Wi-Fi network. Although you are able to connect to Wi-Fi, those steps can also help with Wi-Fi issues such as what you've described. Guidance is as follows.

1 Make sure that your router is on and that you're within range

If you're too far from your Wi-Fi router, you can't get a signal, so make sure that you're within range.

2 Make sure that Wi-Fi is on and that you can see your network

Go to Settings > Wi-Fi and make sure that Wi-Fi is on. Tap the name of your Wi-Fi network to join. A blue checkmark beside a network name means that you're connected.

If you see Auto Join disabled under Settings > Wi-Fi > [Your Network], tap the More Info button and then tap Auto-Join.

3 If asked, enter your Wi-Fi password

If asked, enter the password for your Wi-Fi network. Get help if you don't know your password.

Even if you enter the correct password, you might see an "unable to join the network" message or an "incorrect password" message. Restart all of your devices, then try to enter your password again.

4 Check for issues with your Wi-Fi network

If iOS or iPadOS detects an issue with your Wi-Fi connection, you might see a Wi-Fi recommendation under the name of the Wi-Fi network that you're connected to. For example, you might see the alert "No Internet Connection." To get more information, tap the Wi-Fi network.

5 Check your cables and connections

If you still can't connect to your network or get online, make sure that your router is connected to the modem and turned on.

6 Restart

Restart your iOS or iPadOS device.

Restart your router and cable or DSL modem by unplugging the device and then plugging it back in.

After you restart each device, see if you fixed the issue.

7 Reset your network settings

If you're using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings.

If you're using iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Reset Network Settings.

This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.

Best of luck.