Pipelining stalls and data-forwarding

Question

Assuming no data forwarding, and no hazard detection I've been trying to see if I can optimize this code but since 4 of the 5 statements are data-dependent in some way I keep getting 5 stalls or "NOP" operations. Am I missing something or is there something I can do to decrease the stalls within? code below

1. add x15, x12, x11
2. ld x13, 8(x15)
3. ld x12, 0(x2)
4. or x13, x15, x13
5. sd x13, 0(x15)

enter image description here

Optimize the lines by reducing the amount of stalls within the pipeline without using data forwarding or more statements