shouldn't rejoice that you have magic fast performance---be skeptical
-For this particular misbehaving benchmark suite, GHC has an option
+<div class="bs-callout bs-callout-info">
+#### Defeating let-floating
+Fortunately for this particular misbehaving benchmark suite, GHC has
that will turn off let-floating and restore the first two benchmarks
-to performing as expected.
+to performing in line with the second two.
+You should not react by simply throwing `-fno-full-laziness` into
+every GHC-and-criterion command line, as let-floating helps with
+performance more often than it hurts with benchmarking.