am i getting optimal speed?

Well i dont know if it would make is noticable faster.. but if you have switches available put them in place of the #2 and #3 router. Then enable the wireless feature on the first router.

Or if you dont want to do that, just plug a single wireless capable router into either of the switches, and use for the wireless signals.

A switch is basically a router without all the ways of connection to an isp, and no firewalls. (which is ok cause your first one has it)
 
Yes you can plug a switch of however many ports you need into the router. It will be the optimum setup....
 
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