diff --git a/tests/test_hipparcos.py b/tests/test_hipparcos.py
index ebf2c73f..091ce5fd 100644
--- a/tests/test_hipparcos.py
+++ b/tests/test_hipparcos.py
@@ -151,13 +151,13 @@ def test_iad_refitting():
     """
 
     post, myHipLogProb = nielsen_iad_refitting_test(
-        "{}/HIP027321.d".format(DATADIR), burn_steps=10, mcmc_steps=200, saveplot=None
+        "{}/HIP027321.d".format(DATADIR), burn_steps=10, mcmc_steps=50, saveplot=None
     )
 
     # check that we get reasonable values for the posteriors of the refit IAD
     # (we're only running the MCMC for a few steps, so these are not strict)
-    assert np.isclose(0, np.median(post[:, -1]), atol=0.1)
-    assert np.isclose(myHipLogProb.plx0, np.median(post[:, 0]), atol=0.1)
+    assert np.isclose(0, np.median(post[:, -1]), atol=0.5)
+    assert np.isclose(myHipLogProb.plx0, np.median(post[:, 0]), atol=0.5)
 
 
 def test_save_load_dvd():
@@ -180,13 +180,20 @@ def test_save_load_dvd():
         data_table_with_rvs,
         1.22,
         56.95,
-        mass_err=0.08,
-        plx_err=0.26,
         hipparcos_IAD=myHip,
         fit_secondary_mass=True,
         gaia=myGaia,
     )
-    n_walkers = 50
+
+    # fix some values to speed up fit
+    mySys.sys_priors[0] = 1
+    mySys.sys_priors[1] = 0
+    mySys.sys_priors[2] = 0
+    mySys.sys_priors[3] = 0
+    mySys.sys_priors[4] = 0
+    mySys.sys_priors[5] = 0
+
+    n_walkers = 20
     mySamp = sampler.MCMC(mySys, num_walkers=n_walkers)
     mySamp.run_sampler(n_walkers, burn_steps=0)
     filename = "tmp1.hdf5"
@@ -195,7 +202,7 @@ def test_save_load_dvd():
     myResults = results.Results()
     myResults.load_results(filename)
 
-    # os.system('rm tmp.hdf5')
+    os.system("rm tmp*.hdf5")
 
 
 def test_save_load_2021():
@@ -224,7 +231,16 @@ def test_save_load_2021():
         fit_secondary_mass=True,
         gaia=myGaia,
     )
-    n_walkers = 50
+
+    # fix some values to speed up fit
+    mySys.sys_priors[0] = 1
+    mySys.sys_priors[1] = 0
+    mySys.sys_priors[2] = 0
+    mySys.sys_priors[3] = 0
+    mySys.sys_priors[4] = 0
+    mySys.sys_priors[5] = 0
+
+    n_walkers = 20
     mySamp = sampler.MCMC(mySys, num_walkers=n_walkers)
     mySamp.run_sampler(n_walkers, burn_steps=0)
     filename = "tmp2.hdf5"
@@ -233,12 +249,13 @@ def test_save_load_2021():
     myResults = results.Results()
     myResults.load_results(filename)
 
-    # os.system('rm tmp.hdf5')
+    os.system("rm tmp*.hdf5")
 
 
 if __name__ == "__main__":
     test_save_load_dvd()
-    test_save_load_2021()
+    # test_save_load_2021()
     # test_hipparcos_api()
-    # test_iad_refitting()
     # test_dvd_vs_2021catalog()
+
+    # test_iad_refitting()