wifi speed drops

Hi

Recently,i tried libreelec project but i am facing a major issue. The wifi connection is 3 mbps instead of 7-9mbps that i have on other devices in the same spot ,it's difficult to connect through wired connection because the router is 3-4 meters away, i also tried the connection with a wifi adpater (wifi usb) and i get the same speed. is there any way to fix that issue or somehow increase the connection speed ? because sometimes i also get wifi speed below than 1.3mbps . ( i am using raspberry pi 4b 8GB ram model)

thanks for the precious time of whoever read this thread , and sorry for my bad english

what do you mean by extension cable? Can you drop a link of it? Thank you

I just tried it, nothing the connection speed it is the same but when I connect it with wired connection I get 12mbps but I want with wireless since the router is far from the television that I want to use the libreelec

It can do both 2.4 and 5 but I also see on other threads that libreelec finds only 2.4 connection and not 5 and i meant 12 Mb/s , and i can't with 3 mbps or below to have a proper internet access on libreelec

I am using a default one from from the internet provider but I also have a tp link extender but I am using this one (look image)

Oh but I get better connection speed on all devices can somehow fix it for the libreelec to get better connection instead of 1-3 Mb/s and yes i am sure because the extender wifi duplicates the networks and the normal one is wlan0 and for the extender wlan1 and on both i have the same shifty connection

I just plugged it in and all the networks were duplicated , the one of the pi had wlan0 name and the others had wlan1 which was from the extender

nope, it wasn't the networks were duplicated and I both of my network (with the pi's wifi and with the usb wifi (that can get both 2.4ghz and 5ghz) are the same speed which is 0.8-3 mb/s instead of 7-9 that i have on the same spot in other devices

could you explain what do you mean exactly?