Answer from cs61c-ev (Roland Carlos 16583196) for Question 2
This cannot run at full speed because the add requires the value of $t0, which is being loaded at 0($s1) in the previous instruction, so we cannot add until the lw finishes. One possibility is to hardwire the value from 0($s1) into the ALU we add into right after we find it, but this would require some more control signals.