diff --git a/simpeg/dask/electromagnetics/frequency_domain/simulation.py b/simpeg/dask/electromagnetics/frequency_domain/simulation.py
index 3e3f5c4393..8243560d25 100644
--- a/simpeg/dask/electromagnetics/frequency_domain/simulation.py
+++ b/simpeg/dask/electromagnetics/frequency_domain/simulation.py
@@ -5,7 +5,8 @@
 from ...simulation import getJtJdiag, Jvec, Jtvec, Jmatrix
 import numpy as np
 import scipy.sparse as sp
-from multiprocessing import cpu_count
+
+# from multiprocessing import cpu_count
 from dask import array, compute, delayed
 from simpeg.dask.utils import get_parallel_blocks
 from simpeg.electromagnetics.natural_source.sources import PlanewaveXYPrimary
@@ -98,32 +99,39 @@ def getSourceTerm(self, freq, source=None):
     of the correct size
     """
     if source is None:
-        source_list = self.survey.get_sources_by_frequency(freq)
-        source_block = np.array_split(source_list, cpu_count())
-
-        block_compute = []
-
-        if self.client:
-            sim = self.client.scatter(self)
-
-        for block in source_block:
-            if len(block) == 0:
-                continue
-
-            if self.client:
-                block_compute.append(self.client.submit(source_evaluation, sim, block))
-            else:
-                block_compute.append(delayed(source_evaluation)(self, block))
-
-        if self.client:
-            blocks = self.client.gather(block_compute)
-        else:
-            blocks = compute(block_compute)[0]
+        # if self.client:
+        #     n_splits = int(self.client.cluster.scheduler.total_nthreads / len(self.client.cluster.scheduler.workers))
+        # else:
+        #     n_splits = cpu_count()
+        #
+        # source_list = self.survey.get_sources_by_frequency(freq)
+        # source_block = np.array_split(source_list, n_splits)
+        #
+        # block_compute = []
+        #
+        # if self.client:
+        #     sim = self.client.scatter(self)
+        #     source_block = self.client.scatter(source_block)
+        #
+        # for block in source_block:
+        #     if self.client:
+        #         block_compute.append(self.client.submit(source_evaluation, sim, block))
+        #     else:
+        #         block_compute.append(delayed(source_evaluation)(self, block))
+        #
+        # if self.client:
+        #     blocks = self.client.gather(block_compute)
+        # else:
+        #     blocks = compute(block_compute)[0]
         s_m, s_e = [], []
-        for block in blocks:
-            if block[0]:
-                s_m += block[0]
-                s_e += block[1]
+        # for block in blocks:
+        #     if block[0]:
+        for source in self.survey.get_sources_by_frequency(freq):
+            sm, se = source.eval(self)
+            s_m.append(sm)
+            s_e.append(se)
+            # s_m += block[0]
+            # s_e += block[1]
 
     else:
         sm, se = source.eval(self)
diff --git a/simpeg/dask/electromagnetics/static/induced_polarization/simulation.py b/simpeg/dask/electromagnetics/static/induced_polarization/simulation.py
index 4fbf0d46a5..8768265021 100644
--- a/simpeg/dask/electromagnetics/static/induced_polarization/simulation.py
+++ b/simpeg/dask/electromagnetics/static/induced_polarization/simulation.py
@@ -70,7 +70,7 @@ def dpred(self, m=None, f=None):
     return np.asarray(data)
 
 
-def getJtJdiag(self, m, W=None):
+def getJtJdiag(self, m, W=None, f=None):
     """
     Return the diagonal of JtJ
     """
diff --git a/simpeg/dask/objective_function.py b/simpeg/dask/objective_function.py
index c07c4fa046..a52608a8f3 100644
--- a/simpeg/dask/objective_function.py
+++ b/simpeg/dask/objective_function.py
@@ -55,10 +55,12 @@ def __init__(
         objfcts: list[BaseObjectiveFunction],
         multipliers=None,
         client: Client | None = None,
+        workers: list[str] | None = None,
         **kwargs,
     ):
         self._model: np.ndarray | None = None
         self.client = client
+        self.workers = workers
 
         super().__init__(objfcts=objfcts, multipliers=multipliers, **kwargs)
 
@@ -98,6 +100,20 @@ def client(self, client):
 
         self._client = client
 
+    @property
+    def workers(self):
+        """
+        List of worker addresses
+        """
+        return self._workers
+
+    @workers.setter
+    def workers(self, workers):
+        if not isinstance(workers, list | type(None)):
+            raise TypeError("workers must be a list of strings")
+
+        self._workers = workers
+
     def deriv(self, m, f=None):
         """
         First derivative of the composite objective function is the sum of the
@@ -276,7 +292,12 @@ def objfcts(self, objfcts):
         client = self.client
 
         futures, workers = _validate_type_or_future_of_type(
-            "objfcts", objfcts, L2DataMisfit, client, return_workers=True
+            "objfcts",
+            objfcts,
+            L2DataMisfit,
+            client,
+            workers=self.workers,
+            return_workers=True,
         )
         for objfct, future in zip(objfcts, futures):
             if hasattr(objfct, "name"):
@@ -307,10 +328,3 @@ def residuals(self, m, f=None):
                 )
             )
         return client.gather(residuals)
-
-    @property
-    def workers(self):
-        """
-        Get the list of dask.distributed.workers associated with the objective functions.
-        """
-        return self._workers