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It is perfectly normal behaviour.
Extender is a "band aid" that is actually a repeater. It will receive your data, buffer it and then re-send it to the router. It will not "boost" signal from router, it will pretend to be router and then resend the data. By the nature of 802.11 protocol, when one device is sending everyone else must keep quiet.
So in reality repeater will cut bandwidth in half (more than half in practice) and introduce extra latency.
Extenders are generally frowned upon in industry and never used in business. Proper way to cover larger space with WiFi is by using wired Access Points (also called AP's). Prefferably, AP's should be channel-planned and using different channels in order not to interfere with each other. More modern AP's will also use roaming protocol 802.11r which will allow devices to seamlessly roam from one AP to another without dropouts. Basically, see extender as a "cool collar". It can save you in a pinch (make connection possible) but it is a inferior solution in any other way. If you do not want to install proper wired AP solution you can consider mesh system. It is inferior to wired AP but it will at least use different channel for back-haul, providing somewhat better throughput. It is also easier to install for a layman.
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Thank you for your time,
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