Some questions about mikrotik sxt/sextant

Hello

  1. How we understand Ram Usage?
    How many client can use a sextant or sxt as router and dhcp server? (ether1 was connected to a switch and how many client/pc can connect to ether1?)
    Is need to enable ARP for sxt/sextant interface’s that has a bridge between wlan1 and ether1?

For ex: in this image
5.jpg
Routing is static

  1. How many client can connect to ether1 of router B/C/D/A?
    Is need to enable ARP of the interfaces (ether1 and wlan1) of router E/F/G/H?