iPhone Xs wifi slow (half the speed of iPhone8)

I had the same issue with a brand new iPhone XS. I changed the iPhone's DNS and speeds were back to normal.

Set a custom DNS

You may try Google DNS. Here is how you can do this:

• Go to Settings > Wi-Fi
• Find your Wi-Fi
• Tap on the ℹ button
• Tap Configure DNS and select Manual
• Tap add Server
• Type 8.8.8.8, Google’s DNS numbers.
• Delete all other DNSs
• Tap Save
• You can undo this by selecting Automatic, if you want to do so.

Is it updated to the latest version of iOS? iOS 12.0.1 fixed this issue...

Update your iPhone, iPad, or iPod touch - Apple Support

iOS 12.0.1

iOS 12.0.1 includes bug fixes and improvements for your iPhone or iPad. This update:

• Fixes an issue where some iPhone XS devices did not immediately charge when connected to a Lightning cable
• Resolves an issue that could cause iPhone XS devices to rejoin a Wi-Fi network at 2.4GHz instead of 5GHz 👈🏻
• Restores the original position of the “.?123" key on the iPad keyboard
• Fixes an issue where subtitles may not appear in some video apps
• Addresses an issue where Bluetooth could become unavailable

For information on the security content of Apple software updates, please visit this website: https://support.apple.com/kb/HT201222 

Have you tried this?

Disable Wi-Fi Networking Services

Many users have reported that they’ve solved their issues by disabling Wi-Fi Networking under Settings > Privacy > Location Services > System Services. This only relates to your location being used for Wi-Fi Networking, so it doesn’t disable Wi-Fi.

Wow

I think I found the solution

All you need to do is

1. Make a backup on a computer

2. Factory reset

3. Set up the phone from that backup

4. It should work

This should work as I had the same isssue where my other devices were getting 50Mbps and my iPhone Xs max was only even sometimes getting between 12 to 0

And now I’m getting almost 40

Which is an improvement but it is still not perfect

I hope this works for eve

Are you still restoring a backup from iCloud with new phone? (Check Apple ID - iCloud - backup.... also photos app, and if you are using message sync in iCloud open messages app too)

If so, the phone is prioritizing your backup restore over your speed test. Xs should be 2x faster with newer WiFi chipset. If it still performs like that when restore is complete have diagnostics ran through Apple support app or Apple store.

Hi

Turn your router off for 20 /30 seconds when it's back on go to settings on iPhone down to reset Reset network settings After reset enter your router wireless key.

Later to website check for a firmware for your make of router.

You have 14 days to return iPhone for exchange.

Cheers

Brian 🇬-1F1E7;

I have the same issue with my xsMax and my wife’s XS. My son’s ipad and iphone 7 sit about 300mbps in my back porch and the xs and max sit at 6-12 using wifi sweet spot. Absolutly terrible and now I cannot go back to my X. Working with apple support so they can gather logs but not hopeful.

Nothing works. The only thing that seems to work is to separate the two frequencies, 2.4 GHz and 5GHz and force the iPhone to connect to the 5GHZ band. So far the connection has been steady over 120 mbps all day long.

alexsantisteban wrote:

Nothing works. The only thing that seems to work is to separate the two frequencies, 2.4 GHz and 5GHz and force the iPhone to connect to the 5GHZ band. So far the connection has been steady over 120 mbps all day long.

I have had the two frequencies set separate for long time as I had issues with not sticking to 5 ghz without having separate. As long as I am in house it seems no matter the strength of the signal on the 2.4 and 5 I get the same consistent speeds I have gotten with all my iPhones and iPads and MacBooks based on my ISP plan.

where I start to have issues now with the Xs vs X and older phones is that when I am outside my cell signal is still not very strong in neighborhood but my WIFI always reached me fine in yard around house. -- 2-3 out of 4 WIFI bars but it worked fine up til X. Now my Xs has a flakness with WIFI outside (developed after a couple days was fine for awhile) that results in loosing internet in various apps and my cell is not strong enough to be used WIFI is needed in my yard. I can see the bars flicker from 3 to 1 to zero back to 2 and 3and when I do speed tests outside the WIFI even when showing 3 bars like inside fails to find/connect to server to do test most of time and when I does the speeds are dismal so my phone is having problems in connecting through house outside but no problem even in distant rooms as long as inside.

same issue. tried my 6s and my wife 6s. both have consistent speeds throughout the house. if I walk 3 feet away from my router, speeds cut in half. LTE also *****.

if I don't hear anything from Apple in 1 week, returning this phone. switched from android last year. came to apple to get away from the problems with Android OEMs. I did not pay good money for this to be happening.

Note that you will usually get better throughput on a Mac than a phone because your Mac has a more powerful processor and interfaces designed for higher throughput.

In fact on a Mac the limiting factor is usually your Wi-Fi router; wired most Macs can achieve full gigabit speeds.

Oh, I’ve asked a similar question many times now as it’s annissue I have had since moving from 6+ to X - on my 2nd X in less then 12 months and same issue daily yet the 6+ which has a different antenna - still outperforms the X connectiv