Internet should be faster with Time Warner Cable and SBS 2011

I have a network with a Netgear Prosafe VPN Firewall FVS318G and a SBS2011 server.  The netgear is not doing dhcp or dns and the server is running correctly.   If you plug straight into the TWC connection, you get 35x5 internet.  If everything is in place and you plug into the router or a switch on the network, you get around 8 down and 5 up.   TWC says it is our router.  I have switched the router out to a FVS318 which has the same config and it is still the same speed.   I need some steps to determine why my internet is so slow.  Does it matter that I have 40 clients on the network?  I am told by TWC that I should still get the good speed even with that many clients.  
Help!
Kevin CaldwellOwner of RUseeingRed Tech SolutionsAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
1. Update the firmware.
2. Make sure the WAN port is set to AUTO for speed - if it's set to 10 Mbit, then, with packet overhead, this would explain a lot.
3. If you get your "advertised" speeds by plugging a computer directly in for internet access, then it is the router.  Try a different router.  Call Netgear - I believe they offer lifetime warranties.
4. Time Warner Cable is notorious for having absolutely horrible customer service and service in general, at least in the circles I visit (which includes nationwide mailing lists and a local NYC area consultant group).  Try calling back a few times and maybe you'll get a technician who was mistakenly hired and actually knows what they are doing.
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Kevin CaldwellOwner of RUseeingRed Tech SolutionsAuthor Commented:
So I discovered from Netgear is this.
The FVS318 has a max throughput of 12mbps
The FVS318G has a max throughput of 22mbps
The FVS318N has a max throughput of 95mbps.
I put in the N model in and suddenly the speed was much better.
I had no idea that routers had max throughputs.
Thanks for the help.
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