diff --git a/doc/source/conf.py b/doc/source/conf.py
index 792142c69f..61cc284bf6 100755
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -46,20 +46,21 @@
 # Consider enabling numpydoc validation. See:
 # https://numpydoc.readthedocs.io/en/latest/validation.html#
 numpydoc_validate = True
-numpydoc_validation_checks = {
-    "GL06",  # Found unknown section
-    "GL07",  # Sections are in the wrong order.
-    # "GL08",  # The object does not have a docstring
-    "GL09",  # Deprecation warning should precede extended summary
-    "GL10",  # reST directives {directives} must be followed by two colons
-    "SS01",  # No summary found
-    # "SS02",  # Summary does not start with a capital letter
-    # "SS03", # Summary does not end with a period
-    # "SS04",  # Summary contains heading whitespaces
-    # "SS05", # Summary must start with infinitive verb, not third person
-    "RT02",  # The first line of the Returns section should contain only the
-    # type, unless multiple values are being returned"
-}
+numpydoc_validation_checks = set() # numpydoc validation is turned off due to performance (see PR#44)
+#numpydoc_validation_checks = {
+#    "GL06",  # Found unknown section
+#    "GL07",  # Sections are in the wrong order.
+#    # "GL08",  # The object does not have a docstring
+#    "GL09",  # Deprecation warning should precede extended summary
+#    "GL10",  # reST directives {directives} must be followed by two colons
+#    "SS01",  # No summary found
+#    # "SS02",  # Summary does not start with a capital letter
+#    # "SS03", # Summary does not end with a period
+#    # "SS04",  # Summary contains heading whitespaces
+#    # "SS05", # Summary must start with infinitive verb, not third person
+#    "RT02",  # The first line of the Returns section should contain only the
+#    # type, unless multiple values are being returned"
+#}
 
 # Path to static files
 html_static_path = ["_static"]
diff --git a/tox.ini b/tox.ini
index 61fb542f5b..1b16e6071f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,4 +38,4 @@ description = Check if documentation generates properly
 deps =
     -r{toxinidir}/requirements/requirements_doc.txt
 commands =
-    sphinx-build -d "{toxworkdir}/doc_doctree" doc/source "{toxworkdir}/doc_out" --color -vW -b html
+    sphinx-build -d "{toxworkdir}/doc_doctree" doc/source "{toxworkdir}/doc_out" --color -vW -b html -j auto