As you know Nebraska service center is currently very slow to process cases. Their processing time for I-140 (NIW) seems to be around 10 months while Texas service center processing times are 2.5 months. To fix this situation, people started a petition to have the cases distributed evenly between service centers. This actually helped Texas service center before which was very slow about 5-6 months ago.
For some reason the link keeps disappearing so, please go to change.org and search for:
Distribute the current I-140 workload between TSC and NSC and extend I-693 Validity
For some reason the link keeps disappearing so, please go to change.org and search for:
Distribute the current I-140 workload between TSC and NSC and extend I-693 Validity