Browser loading speed has slowed since I get TMO Home Internet and don't know why.

Now, one needs to either use an app or login to the T-Mobile website to do ANYTHING with their connection settings. Meaning almost nothing CAN be done. Last I looked, there wasn't even a setting to whitelist or blacklist a device until that device had already connected to your network. Which kind of takes away the point of having an option to deny, from a security standpoint anyway.

T-Mobile are not alone in doing this. It seems the norm to have to just 'accept' your ISP are the only people qualified to know how to set-up your own internal network. Dark days indeed.

Anyway, I only found this thread because I'm also having issues with loading times on web pages. Both on laptop and mobile phone, with every browser I've tried.

This is 100% a T-Mobile issue. Occam's Razor...

Older printers often only support WPA or WPA2 authentication. If the printer needs WPA then the gateway needs to be configured with the 2.4 ghz network to support it. The printer specifications should report what it is capable of. Newer printers with newer wireless adapters will usually connect with less effort. 

The problems may be with the wireless radios for the local WIFI delivery. When you use the TP link and or the Ethernet wired connection you are bypassing the T-Mobile local wireless. The cellular uplink connection appears to be working. From your descriptions it could well be your gateway is not running the wireless radios properly. 
If your printer is older it may require you to make a separate 2.4 ghz network to get it to connect with your gateway. Discuss this with them as well. Some older wireless network adapters don't work well with the newer WiFi 6 operation of the THI gateway. There are multiple conversations in the community regarding getting printers to connect. The authentication type for the printer may also demand attention. Make sure the 2.4 ghz SSID also provides the proper authentication type the printer uses. 

I have the same PROBLEM of VERY EXTRA LONG TIME (60-120 sec)  with loading the new page since I switched to TMHI even though we have 4 bars (3700 feet ± from the nearest tower)

1-Then I reconnected our existing router (tp-Link) through the T-M Gateway, and opening the page goes back to “normal”  around 2-3 sec. WHY?

2-Listen to music from Youtube through home audio sytem wirelessly connect from the T-M Gateway WILL GIVE “STATIC/LTTLE RATTLE” eventhogh we got 4 bars (80-90 mb). However if we connect CAT6 cable from our labtop to T-M Gateway, the "Static Noice/Skipping/Rattle " will be gone. WHY?

3-Our wireless printer could not work with T-Mobile Gatewat like we used to do with our existing router (tp-Link), WHY?

Did I connect wrongly, miss something, or just that is just the way T-M Home Internet Gateway work ?

Gracias,

Due to loosing the wireless function/ transmit signals  (only works with ethernet = cable,) tommorrow I have to take the TMHI Gateway to the store nearby to have it replaced with either new SIM card or the whole thing as the TM-Tech online recommended… Did I make a wrong choice with TMHI?

A Windows update could have knackered up some things with the network stack... is prone to locking the receive windows and/or MTU to weird values and such.

Can go to the broadband tools section at speedguide.net to download their TCP Optimizer to reset everything quick and easy.  They may even have a link directly on the home page for it now it has become so popular.  You just right-click it to run as Administrator, pick the network card from the drop menu, and click to reset things to Windows Defaults.  It will prompt to make a backup (has a restore function as well), and then prompt you to reboot the system to apply everything.

After that, go back to speedguide.net and go to their TCP Analyzer page.  It should flag a notice about the MSS/MTU not being optimized.  Windows SHOULD be detecting and setting MTU at 1420, which is not optimal by normal standards but what is required because of their funky IPv4/v6/v4 tunnel crud they are doing (technically, you may be able to override it to 1440, but that can work against you in some network situations...1420 is the more common values used with MTU discovery).

That is important to verify, because if it is too high (ie, trying to run the usual numbers between 1460 and 1500), it can cause packets to be broken down into two smaller packets... bogging things down.

Oh, I appreciate the info you've provided and I will do what I can with it and can't thank you enough. It's just frustrating is all. It's got to be something my PC doesn't like with the TMO home internet. I plan on testing a something later today. I'll use my hotspot on my phone, hard wire it to my PC, unplug the TMO and see if the freezing issue is still there. I'll report what happens. Thank you for everything!

OK sorry. Networking issues often do require getting nerdy at times. It does appear to be a client issue. A bad network card or driver are pretty much the first places to attack. If you have more questions just post them here. If you have some data from the reporting I could take a look at it and see what clues may be there. Windows system logs can be another place to look but if you are not familiar with the tech side of things that could be a bag of snakes. 

It worked before. It can probably be made to work again. It might just take a bit of effort.

Again, thanks! You’re talking a lot of “nerdy” stuff to me, but I’ll see what I can do.

It is wired directly to the router via ethernet. I even changed cables and put the router closer to the pc. It was about 20 feet away, now it's about 4 feet. (yes, brand new cables both times) 

With my laptop, which is wireless, I do not experience these issues.

I know nothing about Linux and have no idea how to do what you asked. Lo sentimos.

It's a strange one, but I know it can be solved by someone. I can't be the only one this has ever happened to.

I’ll buy a case of beer for anyone who can help me solve this issue!  lol

In that case some things to look at: 

• If it is Windows 10, check to be sure there is not an update pending. 
• If W10 reboot it and see if it changes the equation.
• A likely culprit with W10 and the desktop could be a network card driver. (I will assume wireless.) Check for an updated NIC driver and install a new one.
• If it is an older PC maybe the wireless NIC driver is having issues.
• If your PC is close to the router and you can use an Ethernet cable try that instead of wireless.
• If it is W10 open a command window and enter “netstat -e” (no quotes) Look for errors.
• Además netstat -s for protocol statistics. Look a % of errors etc.. to actual connections.

Look at the web interface on the router "Statistics" for the various wireless bands for "Discarded Received Packets". If the PC NIC is not working well it might be error prone. 

If you are familiar with Linux and have or can make a bootable USB drive download say Linux Mint and make a live USB stick to boot from and confirm results with Linux vs W10. I only suggest Mint as it is very simple to use and so similar to Windows for navigation. My experience is that when I boot up with Linux Mint or most Linux distros the wireless is usually detected and it is pretty quick and easy to join the wireless network. If the wireless NIC is a Realtec the probability is good it would work fine. 

thanks! I'll do the cache thing later today. Honestly, I don't think that's it. I was using ATT internet before TMO and that was fine. The day I started using TMO (which, btw I like a LOT better) is when the issue started. I notice, however, it's only doing this "slow loading" with my home PC, not my laptop. It's hard to describe, it's more of a "freezing while loading" instead of "slow loading". When I open up a new tab, I get the spinning wheel in the tab, then it stops for about 3-5 seconds, then continues. Then, when I'm on a page and start to scroll down, I get the freezing thing again.  It happens with all browsers, just with the PC. I never use Edge, and it does it with Edge as well, so that leads me to believe it's not a cache thing. I checked the speeds again, the PING is consistently between 30-35, which is lower than it was with ATT. It has to be something between TMO and the PC as my laptop and phone have zero issues.  ¡Gracias!