diff --git a/tox.ini b/tox.ini
index cdf0a6710f9a..878205b40f6a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,6 +31,7 @@ commands =
 {[testenv]commands}
 stestr run '{posargs}'
 env TEST_OSPROFILER=1 stestr run --combine --no-discover 'nova.tests.unit.test_profiler'
+ stestr slowest
 
 [testenv:py35]
 commands =
@@ -69,6 +70,7 @@ setenv = VIRTUAL_ENV={envdir}
 commands =
 find . -type f -name "*.pyc" -delete
 stestr run '{posargs}'
+ stestr slowest
 
 # TODO(gcb) Merge this into [testenv:functional] when functional tests are gating
 # with python 3.5
@@ -92,6 +94,7 @@ setenv = VIRTUAL_ENV={envdir}
 commands =
 find . -type f -name "*.pyc" -delete
 stestr run '{posargs}'
+ stestr slowest
 
 [testenv:genconfig]
 commands = oslo-config-generator --config-file=etc/nova/nova-config-generator.conf
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