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.
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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.
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?
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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