WHADDAYAMEAN

I see. Kinda weird how there is nearly no information about this on the Internet but whatever. I'm looking into some "budget friendly" routers right now, I wonder if the ASUS RT-AC66U B1 is good enough.

Nope. Connecting directly to router.

Thanks for the information, but I still don't understand what causes the difference in connection speed between my 2 phones.

Which channel is the best? I really don't know Seems like 5Ghz won't get any interference tho

Interference definitely plays a role, since I live in a crowded apartment building with quite a lot of 2.4Ghz signals, but what can I do to verify whether this old router is functioning properly? Also, would a new low end router with 5Ghz improve the situation?

Still what difference does it make? I don't see why a new phone from late 2019 wouldn't be able to stream 1080p60 videos.

I've recently switched to a new phone (Samsung Galaxy A51) and noticed slower wifi speed. I'm using a TP-LINK TL-WR1043ND router with 100Mbps connection from ISP. The "Network speed" shown on my new phone is only 65Mbps and I get around 25Mbps in real world. On my old phone (Samsung Galaxy Note 4) the "Link speed" shown is 130Mbps and reaches about 55-60Mbps in real world. The speed is tested on speedtest.net with my phones about 1 meter away from the router. So my questions are: 1. Why is there such a difference? Makes no sense to me that I'm getting slower wifi connection on a phone 5 years newer. 2. Is there anything I can do to improve my connection speed? Main problem right now is that on my new phone, I can barely watch 1080p60 YouTube videos in my room smoothly as it sometimes buffers, even with no other devices connected to the wifi network. This never happened on my old phone. From about 10 meters away from the router (outside my room), I could easily play 480p YouTube videos no problem on my old phone or 720p on a good day, but now on the new phone it barely plays 360p without buffering.