The evict-btree plot for read throughput has become very jittery and unstable. The jitters started at http://mjc.homeunix.org:8180/job/wiredtiger-perf-evict-btree/1262/. One notable change in there is the RNG. There is also a change for raw compression and eviction. So this may be related to WT-1250. Overall, read throughput is better than the former, stable number, sometimes much better (almost 100%), but the unpredictability is concerning.