I doubt. Our server has a very good line and it's a very powerful server also (Xeon 1.60 GHz processor, 64bit windows 2003 server)
I just run a test with 3 servers running and 2 of them with rank, and I got 9.5 Mb Download Speed and 12.5 Mb Ulpoad speed.
We run on the same server every week and we haven't ever experienced any problem what so ever. se
Usually when the server is having problems you have lags, or warping.
FPS are usually related to the car/track. 500 Abarth is a very nice model but with a lot of polygons. Just use a lower resolution/settings.
With few cars you should not have so many problems but with a full grid you might have a FPS drop.
Apparently in the latest nK version something changed regarding graphics handling, and a lot of people are experience problems, unfortunately. I hope that Kunos with sort this out very soon.