Netgear wifi router R6700 - Internet speed problem

Hello,

I live in Belgium and I have a connection 400mbits download and 20 mbits upload. I contacted my internet provider because I thought that I was limited to 190mbits download (checked with speedtest and also direct download). They told me that there was nothing wrong with my internet. I use my ISP router as bridge and the NETGEAR Router wifi R6700 is directly connected with an RJ45 cable to it.

I decided to test my connection with just my ISP router so I factory reset it, plugged my computer directly on it and disabled wifi 2.4Ghz and 5Ghz. With that setup, I reached close to 400mbits download speed (I think it was 380mbits so close enough). I changed the router configuration to be bridge and connected my R6700 to it. I checked on my computer again and I reached the limited speed of 190mbits download.

I tried to disable the wifi in the panel admin of the R6700 but couldn't find where to do that. The only thing I could uncheck is the SSID broadcast in the wifi settings.

Note: I think I should check again for the "Enable Wireless Router Radio" (https://kb.netgear.com/24101/How-do-I-enable-or-disable-the-wireless-radios-on-my-Nighthawk-router) but I don't remember seeing that.

Anyway, does anybody here know what kind of configuration could limit my internet speed (with RJ45 cable) like that? Could the wifi that is enabled be the cause ? I'll test the speed again tonight if I can find how to disable the wifi completely from the R6700.

Thanks a lot.