Slow Speed's Over Cat 5 UTP?

Hi Everyone,

We recently got UFB installed and its going great over our 2.4/5Ghz WiFi Network!

However over our wired network we seam to be losing some serious speed.. I would really appreciate a networking guru/or anyone that could give me some pointers.

Background Information.

ISP: Spark 100mbps Down 20mbps up.

On the Enable Fibre Network.

Modem: HG659 Standard Firmware

Running a WiFi Network 2.4/5Ghz

DHCP Server Running

Around 20 Clients

Cabling: UTP Cat 5, 24 AWG, Lengths upto 20M

Cable is nearly 20 years old, its in the walls and use to run phone lines though out the house, until we wired up the Ethernet.

Demarc point is in the garage with an old school patch panel for connections.

I have then made up my own patch cables that one end is "punched" into the patch panel and the other has an RJ45 plugged into the HG659 (Router)I can add a photo if this isn't clear, just ask.

Local Performance:

I use Linux and my Gnome Local Network Manager says I'm getting 100Mbps to the router.

I have also tested with iperf with my raspberry pi as the server with a patch cabled straight into the back of the router and can confirm the TCP packets were going at 100mbps.

SpeedTest.net Results:

Average Download on Cat 5 Ethernet: 50~60 Mbps

Average Upload on Cat 5 Ethernet 20 mbps

Cat6 Cable Test:

For testings sake I then ran a long Cat 6 from the same computer up the stairs to the router, it synced up at 1Gbps

SpeedTest.net on that cable gave me the full 110 Mbps!

We can also get this on WiFi if we are close to the router.

So with all that in mind I think its safe to say the Cat 5 in the walls is causing the problem..

But why, Could I have wired it up wrong? Or do you think the lengths are too long ~20M?

Possibly it could be my wiring from the patch panel to the RJ45s in the back of the router. but this all speculation.

Would greatly appreciate any advice on how to trouble shoot this further to narrow down the problem.

Thanks

ps. This is my first post, So please let me know if this format is unclear or if you would like further information. Cheers