Mesh Wifi for a dummy, is the satelite slow?

[OnamCh]

I am thinking of swapping my EE router for a mesh system and was wondering if the slaves are just as quick as the main router? For example:
- Main router downstairs
- Satelite / slave upstairs

My question is, if one device is wired into the main router and another device is wired into the satelite (I guess this is called backhaul) should I expect the same speeds on both? My understanding is that the main router is bouncing the signal to the slave which is another hope which makes me think in theory the slave should be slower?

 

[OnamCh]

This is the same setup I am going but with one satelite upstairs and want to hard wire it to my PC but have it as a hub upstairs for improved wifi. Out of interest what brand have you gone for and model?

 

[OnamCh]

The one I was thinking of getting was the netgear nighthawk (wifi 7). Its overkill but will last a long time I imagine