diff --git a/src/base/optime.h b/src/base/optime.h
index f1b1c48..be45fe4 100644
--- a/src/base/optime.h
+++ b/src/base/optime.h
@@ -2,24 +2,40 @@
 
 #include "std.h"
 
-// executes codeblock and prints execution time
-#ifdef CLOCK_REALTIME // non-standard high-precision clock
-    #define optime(opname,repeats,codeblock) ({\
-        struct timespec start, stop;\
-        clock_gettime(CLOCK_REALTIME, &start);\
-        for(uint64 ___OPREP=0;___OPREP<(uint64)repeats;___OPREP++)\
-            (codeblock);\
-        clock_gettime(CLOCK_REALTIME, &stop);\
-        double t=(double)(stop.tv_sec-start.tv_sec+(double)(stop.tv_nsec-start.tv_nsec)/1000000000)/repeats;\
-        kprintf("\e[93moperation \e[94m%s\e[93m lasted \e[94m%lf \e[93mseconds\n",opname,t);\
-    })
-#else // standard low precision clock
-    #define optime(opname,repeats,codeblock) ({\
-        clock_t start=clock();\
-        for(uint64 ___OPREP=0;___OPREP<(uint64)repeats;___OPREP++)\
-            (codeblock);\
-        clock_t stop=clock();\
-        double t=(double)(stop-start)/CLOCKS_PER_SEC/repeats;\
-        kprintf("\e[93moperation \e[94m%s\e[93m lasted \e[94m%lf \e[93mseconds\n",opname,t);\
-    })
+#define __optime_print(opname, t)\
+    char tnames[3][3]={"s\0","ms","us"};\
+    int tni=0;\
+    if(t>1000000){\
+        t/=1000000;\
+        tni=0;\
+    } else if(t>1000){\
+        t/=1000;\
+        tni=1;\
+    } else tni=2;\
+    kprintf("\e[93moperation \e[94m%s\e[93m lasted \e[94m%f \e[93m%s\n",\
+                                    opname,              t,  tnames[tni]);
+
+#ifdef CLOCK_REALTIME 
+/// executes codeblock and prints execution time
+/// uint64 op_i is counter of the internal loop
+/// uses non-standard high-precision clock
+#define optime(opname,repeats,codeblock) ({\
+    struct timespec start, stop;\
+    clock_gettime(CLOCK_REALTIME, &start);\
+    for(uint64 op_i=0;op_i<(uint64)repeats;op_i++)\
+        (codeblock);\
+    clock_gettime(CLOCK_REALTIME, &stop);\
+    double t=(double)(stop.tv_sec-start.tv_sec)*1000000+(double)(stop.tv_nsec-start.tv_nsec)/1000;\
+    __optime_print(opname,t)\
+})
+#else 
+/// uses standard low precision clock
+#define optime(opname,repeats,codeblock) ({\
+    clock_t start=clock();\
+    for(uint64 op_i=0;op_i<(uint64)repeats;op_i++)\
+        (codeblock);\
+    clock_t stop=clock();\
+    double t=(double)(stop-start)/CLOCKS_PER_SEC*1000000;\
+    __optime_print(opname,t)\
+})
 #endif
diff --git a/tests/main.cpp b/tests/main.cpp
index e816770..9c43add 100644
--- a/tests/main.cpp
+++ b/tests/main.cpp
@@ -6,8 +6,7 @@ int main(){
     ktDescriptors_beginInit();
     ktDescriptors_initKerepTypes();
     ktDescriptors_endInit();
-    kprintf("\e[97mkerep tests are starting!\n");
-    optime("test_all",1,test_all());
+    test_all();
     ktDescriptors_free();
     kprintf("\e[0m\n");
     return 0;
diff --git a/tests/test_autoarr-vs-vector.cpp b/tests/test_autoarr-vs-vector.cpp
index f349435..1ea747d 100644
--- a/tests/test_autoarr-vs-vector.cpp
+++ b/tests/test_autoarr-vs-vector.cpp
@@ -7,34 +7,28 @@ int64 _autoarrVsVector(uint16 blockCount, uint16 blockLength){
     kprintf("\e[94mblock count: %u block length: %u count: " IFWIN("%llu", "%lu") "\n", blockCount, blockLength, (uint64)count);
     Autoarr_int64* ar=Autoarr_create(int64, blockCount, blockLength);
     std::vector<int64> vec=std::vector<int64>();
-    optime("Autoarr_add", 1, ({
-        for(uint32 i=0; i< count; i++)
-            Autoarr_add(ar, i);
-    }));
-    optime("vector_push_back", 1, ({
-        for(uint32 i=0; i< count; i++)
-            vec.push_back(i);
-    }));
+    optime("Autoarr_add", count,
+        Autoarr_add(ar, op_i));
+    optime("vector_push_back", count, 
+        vec.push_back(op_i));
     int64 t=0;
-    optime("Autoarr_get", 1, ({
-        for(uint32 i=0; i< count; i++)
-            t=Autoarr_get(ar, i);
-    }));
-    optime("vector_get", 1, ({
-        for(uint32 i=0; i< count; i++)
-            t=vec[i];
-    }));
+    optime("Autoarr_get", count,
+        t=Autoarr_get(ar, op_i));
+    optime("vector_get", count,
+        t=vec[op_i]);
     Autoarr_free(ar, true);
     return t;
 }
 
 void test_autoarrVsVector(){
-    kprintf("\e[96m-------[test_autoarr_vs_vector]-------\n");
-    _autoarrVsVector(4, 16);
-    _autoarrVsVector(16, 64);
-    _autoarrVsVector(32, 32);
-    _autoarrVsVector(64, 64);
-    _autoarrVsVector(32, 1024);
-    _autoarrVsVector(256, 256);
-    _autoarrVsVector(1024, 1024);
+    optime(__func__, 1, ({
+        kprintf("\e[96m-------[test_autoarr_vs_vector]-------\n");
+        _autoarrVsVector(4, 16);
+        _autoarrVsVector(16, 64);
+        _autoarrVsVector(32, 32);
+        _autoarrVsVector(64, 64);
+        _autoarrVsVector(32, 1024);
+        _autoarrVsVector(256, 256);
+        _autoarrVsVector(1024, 1024);
+    }));
 }
diff --git a/tests/tests.h b/tests/tests.h
index 780a038..c65a4ba 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -20,19 +20,22 @@ void test_kprint();
 void test_type_system();
 
 inline void test_all(){
-    test_type_system();
-    test_string();
-    test_safethrow();
-    test_searchtree();
-    test_autoarr();
-    test_autoarrVsVector();
-    test_hash_functions();
-    test_hashtable();
-    test_dtsod();
-    test_rng_algorithms();
-    test_kprint_colors();
-    test_kprint();
-    kprintf("\e[96m--------------------------------------\e[0m\n");
+    kprintf("\e[97mkerep tests are starting!\n");
+    optime(__func__, 1, ({
+        test_type_system();
+        test_string();
+        test_safethrow();
+        test_searchtree();
+        test_autoarr();
+        test_autoarrVsVector();
+        test_hash_functions();
+        test_hashtable();
+        test_dtsod();
+        test_rng_algorithms();
+        test_kprint_colors();
+        test_kprint();
+        kprintf("\e[96m--------------------------------------\e[0m\n");
+    }));
 }
 
 #define PRINT_SIZEOF(T) kprintf("\e[94m" #T " size: \e[96m" IFWIN("%llu", "%lu") "\n", sizeof(T))