diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -9,6 +9,14 @@
 commands =
   pytest --hypothesis-profile=swh-web-fast --cov {envsitepackagesdir}/swh/web --cov-branch {posargs} {envsitepackagesdir}/swh/web
 
+[testenv:py3-slow]
+deps =
+  .[testing]
+  pytest-cov
+  pytest-django
+commands =
+  pytest --hypothesis-profile=swh-web --cov {envsitepackagesdir}/swh/web --cov-branch {posargs} {envsitepackagesdir}/swh/web
+
 [testenv:flake8]
 skip_install = true
 deps =