I have 30mbps cable internet. The main computer is that fast. I have an ethernet cable running about 30 feet into my living room which is plugged into a network splitter. Then 3 cables, ps3, Tv,bluray player. Why is the ps3 at like 14mbps?
Because you are using multiple devices its like connecting 1 lightbulb to a battery it will shine bright, when you connect 2 light bulbs to the battery they both dim and when you connect a third they are barely producing any light your issue is your 30mbps internet is being split into all of those devices you wont get 30mbps in each device
What are you plugging this is into actually. There really is no such thing as a network splitter. It is likely a switch or maybe in worse case a hub.
The most liklely problem is that your ports negotiated half duplex on you ps3. You could also have it running at 10m but its strange that you get 14m then. I would take the PS3 and remove the switch and plug it directly into the cable going back to the router and see how fast it tests