What is the routing performance of WS-C3560-8PC-S? Can I get 100Mbps out of the interface?
You are right, but you can take the information provided on this page:
and come up with the numbers from the previous page.
Based on the page above, the 8port switch produces 2.7 Mpps which based on my calculations taken from the 2 models listed in the initial link rates about 3.6Gbps..