diff --git a/news/1983.internal b/news/1983.internal
new file mode 100644
index 000000000..b3e2146d3
--- /dev/null
+++ b/news/1983.internal
@@ -0,0 +1 @@
+Consolidate test layers so PAM, Iterate, Blocks, and Workflows all share `PLONE_RESTAPI_DX_FIXTURE` as base, reducing redundant layer setup time. @jensens
diff --git a/src/plone/restapi/testing.py b/src/plone/restapi/testing.py
index a6da8c215..b24cb1389 100644
--- a/src/plone/restapi/testing.py
+++ b/src/plone/restapi/testing.py
@@ -3,7 +3,6 @@
 from plone.app.contenttypes.testing import PLONE_APP_CONTENTTYPES_FIXTURE
 from plone.app.i18n.locales.interfaces import IContentLanguages
 from plone.app.i18n.locales.interfaces import IMetadataLanguages
-from plone.app.iterate.testing import PLONEAPPITERATEDEX_FIXTURE
 from plone.app.testing import applyProfile
 from plone.app.testing import FunctionalTesting
 from plone.app.testing import IntegrationTesting
@@ -174,33 +173,11 @@ def setUpPloneSite(self, portal):
 
 
 class PloneRestApiDXPAMLayer(PloneSandboxLayer):
-    defaultBases = (DATE_TIME_FIXTURE, PLONE_APP_CONTENTTYPES_FIXTURE)
-
-    def setUpZope(self, app, configurationContext):
-        import plone.restapi
-
-        xmlconfig.file("configure.zcml", plone.restapi, context=configurationContext)
-        xmlconfig.file("testing.zcml", plone.restapi, context=configurationContext)
-
-        zope.installProduct(app, "plone.restapi")
+    defaultBases = (PLONE_RESTAPI_DX_FIXTURE,)
 
     def setUpPloneSite(self, portal):
-        portal.acl_users.userFolderAddUser(
-            SITE_OWNER_NAME, SITE_OWNER_PASSWORD, ["Manager"], []
-        )
-        login(portal, SITE_OWNER_NAME)
-        setRoles(portal, TEST_USER_ID, ["Manager"])
-
-        set_supported_languages(portal)
         if portal.portal_setup.profileExists("plone.app.multilingual:default"):
             applyProfile(portal, "plone.app.multilingual:default")
-        applyProfile(portal, "plone.restapi:default")
-        applyProfile(portal, "plone.restapi:testing")
-        add_catalog_indexes(portal, DX_TYPES_INDEXES)
-        set_available_languages()
-        enable_request_language_negotiation(portal)
-        states = portal.portal_workflow["simple_publication_workflow"].states
-        states["published"].title = "Published with accent é"  # noqa: E501
 
 
 PLONE_RESTAPI_DX_PAM_FIXTURE = PloneRestApiDXPAMLayer()
@@ -238,15 +215,34 @@ class PloneRestApiCachingLayer(PloneAppCachingBase):
 
 
 class PloneRestApiDXIterateLayer(PloneSandboxLayer):
-    defaultBases = (PLONEAPPITERATEDEX_FIXTURE,)
+    defaultBases = (PLONE_RESTAPI_DX_FIXTURE,)
 
     def setUpZope(self, app, configurationContext):
-        import plone.restapi
+        import plone.app.iterate
 
-        xmlconfig.file("configure.zcml", plone.restapi, context=configurationContext)
-        xmlconfig.file("testing.zcml", plone.restapi, context=configurationContext)
+        self.loadZCML(package=plone.app.iterate)
+        # Newer plone.app.iterate has tests ZCML
+        try:
+            import plone.app.iterate.tests
 
-        zope.installProduct(app, "plone.restapi")
+            self.loadZCML(package=plone.app.iterate.tests)
+        except (ImportError, FileNotFoundError):
+            pass
+
+    def setUpPloneSite(self, portal):
+        applyProfile(portal, "plone.app.iterate:default")
+        # Profile name changed in newer plone.app.iterate
+        if portal.portal_setup.profileExists("plone.app.iterate.tests:testingdx"):
+            applyProfile(portal, "plone.app.iterate.tests:testingdx")
+        elif portal.portal_setup.profileExists("plone.app.iterate:testingdx"):
+            applyProfile(portal, "plone.app.iterate:testingdx")
+        # Disable automatic versioning of Documents.
+        versioning_behavior = {
+            "plone.app.versioningbehavior.behaviors.IVersionable",
+            "plone.versioning",
+        }
+        fti = portal.portal_types["Document"]
+        fti.behaviors = tuple(set(fti.behaviors).difference(versioning_behavior))
 
 
 PLONE_RESTAPI_ITERATE_FIXTURE = PloneRestApiDXIterateLayer()
diff --git a/src/plone/restapi/tests/test_boolean_value.py b/src/plone/restapi/tests/test_boolean_value.py
index ea38772e0..fd5abc1d0 100644
--- a/src/plone/restapi/tests/test_boolean_value.py
+++ b/src/plone/restapi/tests/test_boolean_value.py
@@ -1,12 +1,12 @@
 from plone.restapi.deserializer import boolean_value
-from plone.restapi.testing import PLONE_RESTAPI_DX_FUNCTIONAL_TESTING
+from plone.restapi.testing import PLONE_RESTAPI_DX_INTEGRATION_TESTING
 
 import unittest
 
 
 class TestBooleanValue(unittest.TestCase):
 
-    layer = PLONE_RESTAPI_DX_FUNCTIONAL_TESTING
+    layer = PLONE_RESTAPI_DX_INTEGRATION_TESTING
 
     def test_true_bool(self):
         self.assertTrue(boolean_value(True))
diff --git a/src/plone/restapi/tests/test_dxfield_publication.py b/src/plone/restapi/tests/test_dxfield_publication.py
index 9ef2b8c59..7c1c201d2 100644
--- a/src/plone/restapi/tests/test_dxfield_publication.py
+++ b/src/plone/restapi/tests/test_dxfield_publication.py
@@ -3,7 +3,6 @@
 from plone.restapi.interfaces import IDeserializeFromJson
 from plone.restapi.interfaces import ISerializeToJson
 from plone.restapi.testing import PLONE_RESTAPI_DX_INTEGRATION_TESTING
-from transaction import commit
 from zope.component import getMultiAdapter
 from zope.component import getUtility
 
@@ -45,8 +44,6 @@ def setUp(self):
         self.app = self.layer["app"]
         self.portal = self.layer["portal"]
 
-        commit()
-
     def tearDown(self):
         os.environ["TZ"] = "UTC"
         time.tzset()
diff --git a/src/plone/restapi/tests/test_indexers.py b/src/plone/restapi/tests/test_indexers.py
index 671a6836b..8ed8fa205 100644
--- a/src/plone/restapi/tests/test_indexers.py
+++ b/src/plone/restapi/tests/test_indexers.py
@@ -1,5 +1,5 @@
 from plone.dexterity.interfaces import IDexterityFTI
-from plone.restapi.testing import PLONE_RESTAPI_BLOCKS_FUNCTIONAL_TESTING
+from plone.restapi.testing import PLONE_RESTAPI_BLOCKS_INTEGRATION_TESTING
 from Products.CMFCore.utils import getToolByName
 from uuid import uuid4
 from zope.component import queryUtility
@@ -89,7 +89,7 @@
 
 class TestSearchableTextIndexer(unittest.TestCase):
 
-    layer = PLONE_RESTAPI_BLOCKS_FUNCTIONAL_TESTING
+    layer = PLONE_RESTAPI_BLOCKS_INTEGRATION_TESTING
 
     def setUp(self):
         self.portal = self.layer["portal"]