@Re330_user 

Hi,

Getting 241 Mbps through a wireless repeater that is rated at "867 Mbps" (5 GHz band of the RE330) can actually be considered a good result.

Here is a short explanation. 
In practical use no Wi-Fi device will ever be able to reach the wireless speed it is rated at. That is the same with any device that you buy from any manufacturer.
A wireless device rated at 867 Mbps commonly yields a usable data throughput of around 400 to 500 Mbps. 
However, unlike a normal wireless router a wireless repeater has to use that available bandwidth to perform two tasks. Send the data back and forth between the router and itself and send that same data back and forth between itself and your phone. Since this happens on the same frequency channel the available bandwidth is shared between the two tasks and hence you end up with around 200 to 250 Mbps.

  @woozle thank you for the answer , i thought it was faulty or maybe other have reached better number than mine