Proper Switch and Router Connecitons

I have a network on first and second floor that used to be 2 separate LANs for security purposes.  Now want to convert to one LAN with static ip. I have 2 switches on the second floor (24 port and 48 port gigabit) with a Cat 6 up link for each to the first floor Router.  Then I have 2 switches on the first floor (2- 24 port gigabit) that are up liked to the same router.  Then WAN 1out to Fiber ISP.  Is this the most efficient and effective configuration or should I have the 2nd floor switches forward to the 1st floor switches and then only 2 connections to the router.

My  concerns are that I maintain enough through put and don't slow the LAN or any VPN connection for incoming data.
 I did try jumping 2nd floor SW1-24port to SW2- 48 port and only using one CAT6 link to 1st floor, but I notice slow down in application transfers.  That is why i want to go back to two up links to the first floor.

Also all servers are on the 1st Floor connected to the switches.

Need all thoughts.
neumonicmikeAsked:
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lruiz52Connect With a Mentor Commented:
In my opinion, your current setup with the hardware you have and everything on the same lan is good. If you were planning on adding a new vlan, then i would stack the switches together to make a Lan port on the router available to configure a new vlan. For now you should be OK.
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lruiz52Commented:
what is the make and model of your switches and router?

what are the port speed of the switches? what is the port speed on the router?
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neumonicmikeAuthor Commented:
All Netgear gigabit auto sensing except for the 48 port witch is smart and has link aggregation.  Routers is Gigabit SRx-5308.
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