In SERVER-24949 we lowered the WiredTiger "close_idle_time" from 27 hours to 10 minutes. As a result, idle file handles may be closed more aggressively. This may have a performance impact for workloads that have long periods of idle activity, since closing idle handles also clears content from the cache.

Consider raising the "close_handle_minimum" threshold, which dictates when an idle handle sweep occurs, up from 250. This would prevent file handle sweeps from running as frequently, and only for workloads where the volume of idle handles is impactful, such as applications with many collections and indexes.