In running the evict-btree-stress-multi.wtperf workload, I've decided I'd really like an option in wtperf and drilled into conn->close to forego the checkpoint on close. This should likely be an undocumented option I believe. My 600 second workload takes 380 seconds after it completes in conn->close. We rarely want anything after the program prints out its performance numbers so the data is now disposable.