diff --git a/tests/12metaprogramming.tests b/tests/12metaprogramming.tests
index 36f324fe3..2580cdeda 100644
--- a/tests/12metaprogramming.tests
+++ b/tests/12metaprogramming.tests
@@ -164,7 +164,7 @@ return: 0
 END
 
 
-TTEST "metaprogramming helpers" MetaUtils_test  <<END
+TEST "metaprogramming helpers" MetaUtils_test  <<END
 return: 0
 END
 
diff --git a/tests/basics/diagnostic-context-test.cpp b/tests/basics/diagnostic-context-test.cpp
index 55374ed8b..2f1168bee 100644
--- a/tests/basics/diagnostic-context-test.cpp
+++ b/tests/basics/diagnostic-context-test.cpp
@@ -40,7 +40,7 @@ namespace test{
   namespace { // private test setup...
     
                              /* WARNING: memory hungry */
-    const uint NUM_THREADS = 100;
+    const uint NUM_THREADS = 75;
     const uint MAX_RAND    = 100*1000;
     
     inline bool
diff --git a/tests/library/c-lib/test-priqueue.c b/tests/library/c-lib/test-priqueue.c
index b3934d89c..bc6459c15 100644
--- a/tests/library/c-lib/test-priqueue.c
+++ b/tests/library/c-lib/test-priqueue.c
@@ -111,7 +111,7 @@ TESTS_BEGIN
 
 
 
-  for (int i = 0; i < 1000000; ++i)
+  for (int i = 0; i < 100000; ++i)
     {
       data = i;
       r = lumiera_priqueue_insert (&pq, &data);
@@ -120,7 +120,7 @@ TESTS_BEGIN
     }
 
 
-  for (int i = 0; i < 1000000; ++i)
+  for (int i = 0; i < 100000; ++i)
     {
       data = rand()%1000000;
       r = lumiera_priqueue_insert (&pq, &data);