As I said, if used as a switch, you can expect full 1000 MBps (+ 2x 10 GBps from SFP+ ports) from all ports in each direction at the same time at all packet lengths.

If used only as a switch, you will get full 1 GBps out of each port.

If you use any routing or bridging, those packets will go through the CPU, which will slow them down considerably as the CPU is not particularly fast. If you need full speed routing as well, you need to look at the CCR instead.