Benchmarking is the process of comparing the cost, cycle time, productivity, or quality of a specific process or method to another that is widely considered to be an industry standard or best practice.
As we are discussing about infa here this falls under Product benchmark.
Benchmarking means "Fastest possible throughput" and "Highest level of scalability" of Powercenter server if you take Infa into consideration.
Perf vs Benchmarking:
Perf and benchmarking are interlinked- Performance of an ETL can be scaled against the benchmark.
It is simply like scoring systems in our schools where for a subject you can score 100, our score is the performance and 100 is the benchmark.