@Heidi_Alp Thank you very much for your reply. I've tried many things and all manipulations were done close to the main Deco, not on the satelites. I played with beamforming, fast roaming, QoS,...

Dear all, I have just installed my Wi-Fi mesh DECO X50 in my house, and the Wi-Fi connection with that mesh is slower than the one without. Of course, for the most distant places, the speed is better...