diff --git a/CMakeLists.txt b/CMakeLists.txt
index 90b4a2669b52..d1f5732b399a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -295,7 +295,7 @@ OCV_OPTION(WITH_NGRAPH "Include nGraph support" WITH_INF_ENGINE
 OCV_OPTION(WITH_JASPER "Include JPEG2K support (Jasper)" ON
   VISIBLE_IF NOT IOS
   VERIFY HAVE_JASPER)
-OCV_OPTION(WITH_OPENJPEG "Include JPEG2K support (OpenJPEG)" ON
+OCV_OPTION(WITH_OPENJPEG "Include JPEG2K support (OpenJPEG)" OFF
   VISIBLE_IF NOT IOS
   VERIFY HAVE_OPENJPEG)
 OCV_OPTION(WITH_JPEG "Include JPEG support" ON
diff --git a/modules/core/src/copy.cpp b/modules/core/src/copy.cpp
index 7f4329df7823..886f69ead2f6 100644
--- a/modules/core/src/copy.cpp
+++ b/modules/core/src/copy.cpp
@@ -981,11 +981,11 @@ static bool ipp_flip(Mat &src, Mat &dst, int flip_mode)
     CV_INSTRUMENT_REGION_IPP();
 
     // Details: https://github.com/opencv/opencv/issues/12943
-    if (flip_mode <= 0 /* swap rows */
-        && cv::ipp::getIppTopFeatures() != ippCPUID_SSE42
-        && (int64_t)(src.total()) * src.elemSize() >= CV_BIG_INT(0x80000000)/*2Gb*/
-    )
-        return false;
+    // if (flip_mode <= 0 /* swap rows */
+    //     && cv::ipp::getIppTopFeatures() != ippCPUID_SSE42
+    //     && (int64_t)(src.total()) * src.elemSize() >= CV_BIG_INT(0x80000000)/*2Gb*/
+    // )
+    //     return false;
 
     IppiAxis ippMode;
     if(flip_mode < 0)
diff --git a/modules/core/src/matrix_operations.cpp b/modules/core/src/matrix_operations.cpp
index ac94ecee7d6d..122519f6ecd7 100644
--- a/modules/core/src/matrix_operations.cpp
+++ b/modules/core/src/matrix_operations.cpp
@@ -8,11 +8,11 @@
 #include "opencl_kernels_core.hpp"
 #include "precomp.hpp"
 
-#undef HAVE_IPP
-#undef CV_IPP_RUN_FAST
-#define CV_IPP_RUN_FAST(f, ...)
-#undef CV_IPP_RUN
-#define CV_IPP_RUN(c, f, ...)
+// #undef HAVE_IPP
+// #undef CV_IPP_RUN_FAST
+// #define CV_IPP_RUN_FAST(f, ...)
+// #undef CV_IPP_RUN
+// #define CV_IPP_RUN(c, f, ...)
 
 /*************************************************************************************************\
                                         Matrix Operations
diff --git a/modules/core/src/mean.dispatch.cpp b/modules/core/src/mean.dispatch.cpp
index 7a8f9413fc41..3c837c137d33 100644
--- a/modules/core/src/mean.dispatch.cpp
+++ b/modules/core/src/mean.dispatch.cpp
@@ -8,11 +8,11 @@
 #include "opencv2/core/openvx/ovx_defs.hpp"
 #include "stat.hpp"
 
-#undef HAVE_IPP
-#undef CV_IPP_RUN_FAST
-#define CV_IPP_RUN_FAST(f, ...)
-#undef CV_IPP_RUN
-#define CV_IPP_RUN(c, f, ...)
+// #undef HAVE_IPP
+// #undef CV_IPP_RUN_FAST
+// #define CV_IPP_RUN_FAST(f, ...)
+// #undef CV_IPP_RUN
+// #define CV_IPP_RUN(c, f, ...)
 
 #include "mean.simd.hpp"
 #include "mean.simd_declarations.hpp" // defines CV_CPU_DISPATCH_MODES_ALL=AVX2,...,BASELINE based on CMakeLists.txt content
diff --git a/modules/core/src/minmax.cpp b/modules/core/src/minmax.cpp
index 61bddc3d3567..68658261da91 100644
--- a/modules/core/src/minmax.cpp
+++ b/modules/core/src/minmax.cpp
@@ -8,11 +8,11 @@
 #include "opencv2/core/openvx/ovx_defs.hpp"
 #include "stat.hpp"
 
-#undef HAVE_IPP
-#undef CV_IPP_RUN_FAST
-#define CV_IPP_RUN_FAST(f, ...)
-#undef CV_IPP_RUN
-#define CV_IPP_RUN(c, f, ...)
+// #undef HAVE_IPP
+// #undef CV_IPP_RUN_FAST
+// #define CV_IPP_RUN_FAST(f, ...)
+// #undef CV_IPP_RUN
+// #define CV_IPP_RUN(c, f, ...)
 
 #define IPP_DISABLE_MINMAXIDX_MANY_ROWS 1  // see Core_MinMaxIdx.rows_overflow test
 
diff --git a/modules/core/src/norm.cpp b/modules/core/src/norm.cpp
index 088c163c873b..f5f4513ed4f2 100644
--- a/modules/core/src/norm.cpp
+++ b/modules/core/src/norm.cpp
@@ -1008,16 +1008,17 @@ static bool ipp_norm(InputArray _src1, InputArray _src2, int normType, InputArra
                 type == CV_16UC3 ? (ippiMaskNormDiffFuncC3)ippiNormDiff_L2_16u_C3CMR :
                 type == CV_32FC3 ? (ippiMaskNormDiffFuncC3)ippiNormDiff_L2_32f_C3CMR :
                 0) : 0;
-            if (cv::ipp::getIppTopFeatures() & (
-#if IPP_VERSION_X100 >= 201700
-                    ippCPUID_AVX512F |
-#endif
-                    ippCPUID_AVX2)
-            ) // IPP_DISABLE_NORM_16UC3_mask_small (#11399)
-            {
-                if (normType == NORM_L1 && type == CV_16UC3 && sz.width < 16)
-                    return false;
-            }
+                // if (cv::ipp::getIppTopFeatures() & ippCPUID_AVX2)
+            // if (cv::ipp::getIppTopFeatures() & (
+// #if IPP_VERSION_X100 >= 201700
+//                     ippCPUID_AVX512F |
+// #endif
+//                     ippCPUID_AVX2)
+//             ) // IPP_DISABLE_NORM_16UC3_mask_small (#11399)
+            // {
+            //     if (normType == NORM_L1 && type == CV_16UC3 && sz.width < 16)
+            //         return false;
+            // }
             if( ippiNormDiff_C3CMR )
             {
                 Ipp64f norm1, norm2, norm3;
diff --git a/modules/core/src/sum.dispatch.cpp b/modules/core/src/sum.dispatch.cpp
index 20caca9f0453..9c8515592606 100644
--- a/modules/core/src/sum.dispatch.cpp
+++ b/modules/core/src/sum.dispatch.cpp
@@ -10,11 +10,11 @@
 #include "sum.simd.hpp"
 #include "sum.simd_declarations.hpp" // defines CV_CPU_DISPATCH_MODES_ALL=AVX2,...,BASELINE based on CMakeLists.txt content
 
-#undef HAVE_IPP
+/* #undef HAVE_IPP
 #undef CV_IPP_RUN_FAST
 #define CV_IPP_RUN_FAST(f, ...)
 #undef CV_IPP_RUN
-#define CV_IPP_RUN(c, f, ...)
+#define CV_IPP_RUN(c, f, ...) */
 
 namespace cv
 {
diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index 3acf77035ffc..496b307ccade 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -2303,6 +2303,7 @@ struct IPPInitSingleton
 
             if(env == "disabled")
             {
+                printf("Hi there! env is disabled!!!\n");
                 std::cerr << "WARNING: IPP was disabled by OPENCV_IPP environment variable" << std::endl;
                 useIPP = false;
             }
@@ -2337,6 +2338,12 @@ struct IPPInitSingleton
             ))
         {
             useIPP = false;
+            printf("cpuFeatures = %lu\n", cpuFeatures);
+            printf("cpuFeatures&ippCPUID_AVX512F = %lu\n", cpuFeatures&ippCPUID_AVX512F);
+            printf("cpuFeatures&ippCPUID_AVX2 = %lu\n", cpuFeatures&ippCPUID_AVX2);
+            printf("cpuFeatures&ippCPUID_SSE42 = %lu\n", cpuFeatures&ippCPUID_SSE42);
+            printf("ippCPUID_SSE42 = %lu\n", ippCPUID_SSE42);
+            printf("useIPP 0 = %d\n", useIPP);
             return;
         }
 
diff --git a/modules/core/test/test_arithm.cpp b/modules/core/test/test_arithm.cpp
index 75a7004f8191..756957a8d15f 100644
--- a/modules/core/test/test_arithm.cpp
+++ b/modules/core/test/test_arithm.cpp
@@ -2445,9 +2445,9 @@ TEST(Core_MinMaxIdx, rows_overflow)
 
         double minVal0 = 0, maxVal0 = 0;
         int minIdx0[CV_MAX_DIM] = { 0 }, maxIdx0[CV_MAX_DIM] = { 0 };
-        cv::ipp::setUseIPP(false);
+        // cv::ipp::setUseIPP(false);
         cv::minMaxIdx(m, &minVal0, &maxVal0, minIdx0, maxIdx0);
-        cv::ipp::setUseIPP(true);
+        // cv::ipp::setUseIPP(true);
 
         EXPECT_FALSE(fabs(minVal0 - minVal) > 1e-6 || fabs(maxVal0 - maxVal) > 1e-6) << "NxM=" << N << "x" << M <<
             "    min=" << minVal0 << " vs " <<  minVal <<
diff --git a/modules/core/test/test_mat.cpp b/modules/core/test/test_mat.cpp
index 578f693dbf96..d7ac167d865c 100644
--- a/modules/core/test/test_mat.cpp
+++ b/modules/core/test/test_mat.cpp
@@ -2156,7 +2156,7 @@ TEST(Core_Eigen, cv2eigen_tensormap_check_tensormap_access)
 
 TEST(Mat, regression_12943)  // memory usage: ~4.5 Gb
 {
-    applyTestTag(CV_TEST_TAG_MEMORY_6GB);
+    // applyTestTag(CV_TEST_TAG_MEMORY_6GB);
 
     const int width = 0x8000;
     const int height = 0x10001;
diff --git a/modules/imgproc/src/corner.cpp b/modules/imgproc/src/corner.cpp
index f0ea0b5bb5e1..1b18eab2f395 100644
--- a/modules/imgproc/src/corner.cpp
+++ b/modules/imgproc/src/corner.cpp
@@ -471,7 +471,8 @@ static bool ocl_preCornerDetect( InputArray _src, OutputArray _dst, int ksize, i
 
 }
 
-#if 0 //defined(HAVE_IPP)
+#if defined(HAVE_IPP)
+// #if 0 //defined(HAVE_IPP)
 namespace cv
 {
 static bool ipp_cornerMinEigenVal( InputArray _src, OutputArray _dst, int blockSize, int ksize, int borderType )
@@ -554,7 +555,7 @@ void cv::cornerMinEigenVal( InputArray _src, OutputArray _dst, int blockSize, in
     CV_OCL_RUN(_src.dims() <= 2 && _dst.isUMat(),
                ocl_cornerMinEigenValVecs(_src, _dst, blockSize, ksize, 0.0, borderType, MINEIGENVAL))
 
-/*#ifdef HAVE_IPP
+#ifdef HAVE_IPP
     int kerSize = (ksize < 0)?3:ksize;
     bool isolated = (borderType & BORDER_ISOLATED) != 0;
     int borderTypeNI = borderType & ~BORDER_ISOLATED;
@@ -562,7 +563,7 @@ void cv::cornerMinEigenVal( InputArray _src, OutputArray _dst, int blockSize, in
     CV_IPP_RUN(((borderTypeNI == BORDER_REPLICATE && (!_src.isSubmatrix() || isolated)) &&
             (kerSize == 3 || kerSize == 5) && (blockSize == 3 || blockSize == 5)) && IPP_VERSION_X100 >= 800,
         ipp_cornerMinEigenVal( _src, _dst, blockSize, ksize, borderType ));
-    */
+   
 
     Mat src = _src.getMat();
     _dst.create( src.size(), CV_32FC1 );
diff --git a/modules/imgproc/src/deriv.cpp b/modules/imgproc/src/deriv.cpp
index 2d8b59926dcb..61335725c04a 100644
--- a/modules/imgproc/src/deriv.cpp
+++ b/modules/imgproc/src/deriv.cpp
@@ -260,7 +260,8 @@ namespace cv
 }
 #endif
 
-#if 0 //defined HAVE_IPP
+#if defined HAVE_IPP
+// #if 0 //defined HAVE_IPP
 namespace cv
 {
 
@@ -459,7 +460,7 @@ void cv::Sobel( InputArray _src, OutputArray _dst, int ddepth, int dx, int dy,
     CV_OVX_RUN(true,
                openvx_sobel(src, dst, dx, dy, ksize, scale, delta, borderType))
 
-    //CV_IPP_RUN_FAST(ipp_Deriv(src, dst, dx, dy, ksize, scale, delta, borderType));
+    CV_IPP_RUN_FAST(ipp_Deriv(src, dst, dx, dy, ksize, scale, delta, borderType));
 
     sepFilter2D(src, dst, ddepth, kx, ky, Point(-1, -1), delta, borderType );
 }
@@ -511,7 +512,7 @@ void cv::Scharr( InputArray _src, OutputArray _dst, int ddepth, int dx, int dy,
     CALL_HAL(scharr, cv_hal_scharr, src.ptr(), src.step, dst.ptr(), dst.step, src.cols, src.rows, sdepth, ddepth, cn,
              ofs.x, ofs.y, wsz.width - src.cols - ofs.x, wsz.height - src.rows - ofs.y, dx, dy, scale, delta, borderType&~BORDER_ISOLATED);
 
-    //CV_IPP_RUN_FAST(ipp_Deriv(src, dst, dx, dy, 0, scale, delta, borderType));
+    CV_IPP_RUN_FAST(ipp_Deriv(src, dst, dx, dy, 0, scale, delta, borderType));
 
     sepFilter2D( src, dst, ddepth, kx, ky, Point(-1, -1), delta, borderType );
 }
diff --git a/modules/imgproc/src/distransform.cpp b/modules/imgproc/src/distransform.cpp
index a2c5a0d5fdd9..911e603e3d39 100644
--- a/modules/imgproc/src/distransform.cpp
+++ b/modules/imgproc/src/distransform.cpp
@@ -795,7 +795,7 @@ void cv::distanceTransform( InputArray _src, OutputArray _dst, OutputArray _labe
     {
         if( maskSize == CV_DIST_MASK_3 )
         {
-#if defined (HAVE_IPP) && (IPP_VERSION_X100 >= 700) && 0  // disabled: https://github.com/opencv/opencv/issues/15904
+#if defined (HAVE_IPP) && (IPP_VERSION_X100 >= 700) //&& 0  // disabled: https://github.com/opencv/opencv/issues/15904
             CV_IPP_CHECK()
             {
                 IppiSize roi = { src.cols, src.rows };
diff --git a/modules/imgproc/src/filter.dispatch.cpp b/modules/imgproc/src/filter.dispatch.cpp
index c9d1bb457ca2..49283c516497 100644
--- a/modules/imgproc/src/filter.dispatch.cpp
+++ b/modules/imgproc/src/filter.dispatch.cpp
@@ -1187,7 +1187,8 @@ static bool replacementFilter2D(int stype, int dtype, int kernel_type,
     return success;
 }
 
-#if 0 //defined HAVE_IPP
+#if defined HAVE_IPP
+// #if 0 //defined HAVE_IPP
 static bool ippFilter2D(int stype, int dtype, int kernel_type,
               uchar * src_data, size_t src_step,
               uchar * dst_data, size_t dst_step,
@@ -1451,7 +1452,7 @@ void filter2D(int stype, int dtype, int kernel_type,
     if (res)
         return;
 
-    /*CV_IPP_RUN_FAST(ippFilter2D(stype, dtype, kernel_type,
+    CV_IPP_RUN_FAST(ippFilter2D(stype, dtype, kernel_type,
                               src_data, src_step,
                               dst_data, dst_step,
                               width, height,
@@ -1460,7 +1461,7 @@ void filter2D(int stype, int dtype, int kernel_type,
                               kernel_data, kernel_step,
                               kernel_width, kernel_height,
                               anchor_x, anchor_y,
-                              delta, borderType, isSubmatrix))*/
+                              delta, borderType, isSubmatrix))
 
     res = dftFilter2D(stype, dtype, kernel_type,
                       src_data, src_step,
diff --git a/modules/imgproc/src/median_blur.dispatch.cpp b/modules/imgproc/src/median_blur.dispatch.cpp
index 949a0a9ecedd..1ba0735828ab 100644
--- a/modules/imgproc/src/median_blur.dispatch.cpp
+++ b/modules/imgproc/src/median_blur.dispatch.cpp
@@ -203,7 +203,8 @@ static bool openvx_medianFilter(InputArray _src, OutputArray _dst, int ksize)
 }
 #endif
 
-#if 0 //defined HAVE_IPP
+#if defined HAVE_IPP
+// #if 0 //defined HAVE_IPP
 static bool ipp_medianFilter(Mat &src0, Mat &dst, int ksize)
 {
     CV_INSTRUMENT_REGION_IPP();
@@ -303,7 +304,7 @@ void medianBlur( InputArray _src0, OutputArray _dst, int ksize )
     CV_OVX_RUN(true,
                openvx_medianFilter(_src0, _dst, ksize))
 
-    //CV_IPP_RUN_FAST(ipp_medianFilter(src0, dst, ksize));
+    CV_IPP_RUN_FAST(ipp_medianFilter(src0, dst, ksize));
 
     CV_CPU_DISPATCH(medianBlur, (src0, dst, ksize),
         CV_CPU_DISPATCH_MODES_ALL);
diff --git a/modules/imgproc/src/morph.dispatch.cpp b/modules/imgproc/src/morph.dispatch.cpp
index 45ae3994d9ac..289a211c52cf 100644
--- a/modules/imgproc/src/morph.dispatch.cpp
+++ b/modules/imgproc/src/morph.dispatch.cpp
@@ -221,7 +221,8 @@ static bool halMorph(int op, int src_type, int dst_type,
 }
 
 // ===== 2. IPP implementation
-#if 0 //defined HAVE_IPP
+#if defined HAVE_IPP
+// #if 0 //defined HAVE_IPP
 #ifdef HAVE_IPP_IW
 static inline IwiMorphologyType ippiGetMorphologyType(int morphOp)
 {
@@ -495,12 +496,12 @@ void morph(int op, int src_type, int dst_type,
             return;
     }
 
-    /*CV_IPP_RUN_FAST(ippMorph(op, src_type, dst_type, src_data, src_step, dst_data, dst_step, width, height,
+    CV_IPP_RUN_FAST(ippMorph(op, src_type, dst_type, src_data, src_step, dst_data, dst_step, width, height,
                             roi_width, roi_height, roi_x, roi_y,
                             roi_width2, roi_height2, roi_x2, roi_y2,
                             kernel_type, kernel_data, kernel_step,
                             kernel_width, kernel_height, anchor_x, anchor_y,
-                            borderType, borderValue, iterations, isSubmatrix));*/
+                            borderType, borderValue, iterations, isSubmatrix));
 
     ocvMorph(op, src_type, dst_type, src_data, src_step, dst_data, dst_step, width, height,
              roi_width, roi_height, roi_x, roi_y,
@@ -1085,7 +1086,8 @@ static bool ocl_morphologyEx(InputArray _src, OutputArray _dst, int op,
 #endif
 
 #define IPP_DISABLE_MORPH_ADV 1
-#if 0 //defined HAVE_IPP
+#if defined HAVE_IPP
+// #if 0 //defined HAVE_IPP
 #if !IPP_DISABLE_MORPH_ADV
 static bool ipp_morphologyEx(int op, InputArray _src, OutputArray _dst,
                      InputArray _kernel,
@@ -1182,7 +1184,7 @@ void morphologyEx( InputArray _src, OutputArray _dst, int op,
     Mat dst = _dst.getMat();
 
 #if !IPP_DISABLE_MORPH_ADV
-    //CV_IPP_RUN_FAST(ipp_morphologyEx(op, src, dst, kernel, anchor, iterations, borderType, borderValue));
+    CV_IPP_RUN_FAST(ipp_morphologyEx(op, src, dst, kernel, anchor, iterations, borderType, borderValue));
 #endif
 
     switch( op )
diff --git a/modules/imgproc/src/thresh.cpp b/modules/imgproc/src/thresh.cpp
index 7cd8ff0b22b6..6875410a5788 100644
--- a/modules/imgproc/src/thresh.cpp
+++ b/modules/imgproc/src/thresh.cpp
@@ -757,7 +757,7 @@ thresh_32f( const Mat& _src, Mat& _dst, float thresh, float maxval, int type )
             }
             setIppErrorStatus();
             break;
-#if 0  // details: https://github.com/opencv/opencv/pull/16085
+// #if 0  // details: https://github.com/opencv/opencv/pull/16085
         case THRESH_TOZERO:
             if (0 <= CV_INSTRUMENT_FUN_IPP(ippiThreshold_LTVal_32f_C1R, src, (int)src_step*sizeof(src[0]), dst, (int)dst_step*sizeof(dst[0]), sz, thresh + FLT_EPSILON, 0))
             {
@@ -766,7 +766,7 @@ thresh_32f( const Mat& _src, Mat& _dst, float thresh, float maxval, int type )
             }
             setIppErrorStatus();
             break;
-#endif
+// #endif
         case THRESH_TOZERO_INV:
             if (0 <= CV_INSTRUMENT_FUN_IPP(ippiThreshold_GTVal_32f_C1R, src, (int)src_step*sizeof(src[0]), dst, (int)dst_step*sizeof(dst[0]), sz, thresh, 0))
             {
diff --git a/modules/ts/src/ts.cpp b/modules/ts/src/ts.cpp
index c7226ba0a3e5..ced607009346 100644
--- a/modules/ts/src/ts.cpp
+++ b/modules/ts/src/ts.cpp
@@ -1122,6 +1122,7 @@ void SystemInfoCollector::OnTestProgramStart(const testing::UnitTest&)
     }
     recordPropertyVerbose("cv_cpu_features", "CPU features", cv::getCPUFeaturesLine());
 #ifdef HAVE_IPP
+    printf("Hi there! IPP is %d\n", cv::ipp::useIPP());
     recordPropertyVerbose("cv_ipp_version", "Intel(R) IPP version", cv::ipp::useIPP() ? cv::ipp::getIppVersion() :  "disabled");
 #endif
 #ifdef HAVE_OPENCL
diff --git a/modules/ts/src/ts_tags.cpp b/modules/ts/src/ts_tags.cpp
index 8bed1b739fa3..e07b97f8fb45 100644
--- a/modules/ts/src/ts_tags.cpp
+++ b/modules/ts/src/ts_tags.cpp
@@ -48,8 +48,9 @@ static std::vector<std::string>& getTestTagsSkipList()
 #if OPENCV_32BIT_CONFIGURATION
         testSkipWithTags.push_back(CV_TEST_TAG_MEMORY_2GB);
 #else
-        if (!cvtest::runBigDataTests)
-            testSkipWithTags.push_back(CV_TEST_TAG_MEMORY_6GB);
+        testSkipWithTags.push_back(CV_TEST_TAG_MEMORY_6GB);
+        // if (!cvtest::runBigDataTests)
+        //     testSkipWithTags.push_back(CV_TEST_TAG_MEMORY_6GB);
 #endif
         testSkipWithTags.push_back(CV_TEST_TAG_VERYLONG);
 #if defined(_DEBUG)