Not generally the hammer spring
When making performance adjustments the hammer spring force is normally the fine tuning tool.
Major power changes will be related to the Guns valve volume, porting, hammer weight & valve head size.
Many times we see Enthusiasts want to stand on the hammer spring but that really is the least elegant of solutions.
Reducing valve return spring tension often will have a similar result to increasing hammer spring without compromising trigger pull weight in the process.
Tim