diff --git a/CHANGELOG.md b/CHANGELOG.md
index d70d0fc73..f43e11974 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# v5.1.1
+- [#1365](https://github.com/xmrig/xmrig/issues/1365) Fixed various system response/stability issues.
+  - Added new CPU option `yield` and command line equivalent `--cpu-no-yield`.
+- [#1363](https://github.com/xmrig/xmrig/issues/1363) Fixed wrong priority of main miner thread.
+
 # v5.1.0
 - [#1351](https://github.com/xmrig/xmrig/pull/1351) RandomX optimizations and fixes.
   - Improved RandomX performance (up to +6-7% on Intel CPUs, +2-3% on Ryzen CPUs)
diff --git a/README.md b/README.md
index 6b7ce909e..7563ff2d9 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,7 @@ CPU backend:
       --cpu-priority            set process priority (0 idle, 2 normal to 5 highest)
       --cpu-max-threads-hint=N  maximum CPU threads count (in percentage) hint for autoconfig
       --cpu-memory-pool=N       number of 2 MB pages for persistent memory pool, -1 (auto), 0 (disable)
+      --cpu-no-yield            prefer maximum hashrate rather than system response/stability
       --no-huge-pages           disable huge pages support
       --asm=ASM                 ASM optimizations, possible values: auto, none, intel, ryzen, bulldozer
       --randomx-init=N          threads count to initialize RandomX dataset
diff --git a/doc/CPU.md b/doc/CPU.md
index c830590f4..385af6ad5 100644
--- a/doc/CPU.md
+++ b/doc/CPU.md
@@ -99,4 +99,7 @@ Allow override automatically detected Argon2 implementation, this option added m
 Maximum CPU threads count (in percentage) hint for autoconfig. [CPU_MAX_USAGE.md](CPU_MAX_USAGE.md)
 
 #### `memory-pool` (since v4.3.0)
-Use continuous, persistent memory block for mining threads, useful for preserve huge pages allocation while algorithm swithing. Default value `false` (feature disabled) or `true` or specific count of 2 MB huge pages.
+Use continuous, persistent memory block for mining threads, useful for preserve huge pages allocation while algorithm swithing. Possible values `false` (feature disabled, by default) or `true` or specific count of 2 MB huge pages.
+
+#### `yield` (since v5.1.1)
+Prefer system better system response/stability `true` (default value) or maximum hashrate `false`.
diff --git a/src/App.cpp b/src/App.cpp
index 1908482c1..3acccc5df 100644
--- a/src/App.cpp
+++ b/src/App.cpp
@@ -90,8 +90,6 @@ int xmrig::App::exec()
 
     m_controller->start();
 
-    Platform::setThreadPriority(5);
-
     rc = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
     uv_loop_close(uv_default_loop());
 
diff --git a/src/backend/common/Hashrate.cpp b/src/backend/common/Hashrate.cpp
index dedb74955..eb01a5fb0 100644
--- a/src/backend/common/Hashrate.cpp
+++ b/src/backend/common/Hashrate.cpp
@@ -30,6 +30,7 @@
 
 
 #include "backend/common/Hashrate.h"
+#include "base/io/json/Json.h"
 #include "base/tools/Chrono.h"
 #include "base/tools/Handle.h"
 #include "rapidjson/document.h"
@@ -157,13 +158,7 @@ const char *xmrig::Hashrate::format(double h, char *buf, size_t size)
 
 rapidjson::Value xmrig::Hashrate::normalize(double d)
 {
-    using namespace rapidjson;
-
-    if (!std::isnormal(d)) {
-        return Value(kNullType);
-    }
-
-    return Value(floor(d * 100.0) / 100.0);
+    return Json::normalize(d, false);
 }
 
 
diff --git a/src/backend/cpu/CpuConfig.cpp b/src/backend/cpu/CpuConfig.cpp
index e9abd9e66..7ebe904bd 100644
--- a/src/backend/cpu/CpuConfig.cpp
+++ b/src/backend/cpu/CpuConfig.cpp
@@ -38,6 +38,7 @@ static const char *kHwAes               = "hw-aes";
 static const char *kMaxThreadsHint      = "max-threads-hint";
 static const char *kMemoryPool          = "memory-pool";
 static const char *kPriority            = "priority";
+static const char *kYield               = "yield";
 
 #ifdef XMRIG_FEATURE_ASM
 static const char *kAsm = "asm";
@@ -70,6 +71,7 @@ rapidjson::Value xmrig::CpuConfig::toJSON(rapidjson::Document &doc) const
     obj.AddMember(StringRef(kHwAes),        m_aes == AES_AUTO ? Value(kNullType) : Value(m_aes == AES_HW), allocator);
     obj.AddMember(StringRef(kPriority),     priority() != -1 ? Value(priority()) : Value(kNullType), allocator);
     obj.AddMember(StringRef(kMemoryPool),   m_memoryPool < 1 ? Value(m_memoryPool < 0) : Value(m_memoryPool), allocator);
+    obj.AddMember(StringRef(kYield),        m_yield, allocator);
 
     if (m_threads.isEmpty()) {
         obj.AddMember(StringRef(kMaxThreadsHint), m_limit, allocator);
@@ -120,6 +122,7 @@ void xmrig::CpuConfig::read(const rapidjson::Value &value)
         m_enabled   = Json::getBool(value, kEnabled, m_enabled);
         m_hugePages = Json::getBool(value, kHugePages, m_hugePages);
         m_limit     = Json::getUint(value, kMaxThreadsHint, m_limit);
+        m_yield     = Json::getBool(value, kYield, m_yield);
 
         setAesMode(Json::getValue(value, kHwAes));
         setPriority(Json::getInt(value,  kPriority, -1));
diff --git a/src/backend/cpu/CpuConfig.h b/src/backend/cpu/CpuConfig.h
index fa48e07bf..2306057fc 100644
--- a/src/backend/cpu/CpuConfig.h
+++ b/src/backend/cpu/CpuConfig.h
@@ -55,6 +55,7 @@ public:
     inline bool isEnabled() const                       { return m_enabled; }
     inline bool isHugePages() const                     { return m_hugePages; }
     inline bool isShouldSave() const                    { return m_shouldSave; }
+    inline bool isYield() const                         { return m_yield; }
     inline const Assembly &assembly() const             { return m_assembly; }
     inline const String &argon2Impl() const             { return m_argon2Impl; }
     inline const Threads<CpuThreads> &threads() const   { return m_threads; }
@@ -72,6 +73,7 @@ private:
     bool m_enabled       = true;
     bool m_hugePages     = true;
     bool m_shouldSave    = false;
+    bool m_yield         = true;
     int m_memoryPool     = 0;
     int m_priority       = -1;
     String m_argon2Impl;
diff --git a/src/backend/cpu/CpuLaunchData.cpp b/src/backend/cpu/CpuLaunchData.cpp
index bbfc6bba9..76da267c1 100644
--- a/src/backend/cpu/CpuLaunchData.cpp
+++ b/src/backend/cpu/CpuLaunchData.cpp
@@ -38,6 +38,7 @@ xmrig::CpuLaunchData::CpuLaunchData(const Miner *miner, const Algorithm &algorit
     assembly(config.assembly()),
     hugePages(config.isHugePages()),
     hwAES(config.isHwAES()),
+    yield(config.isYield()),
     priority(config.priority()),
     affinity(thread.affinity()),
     miner(miner),
diff --git a/src/backend/cpu/CpuLaunchData.h b/src/backend/cpu/CpuLaunchData.h
index 586738447..6a1ee30e4 100644
--- a/src/backend/cpu/CpuLaunchData.h
+++ b/src/backend/cpu/CpuLaunchData.h
@@ -60,6 +60,7 @@ public:
     const Assembly assembly;
     const bool hugePages;
     const bool hwAES;
+    const bool yield;
     const int priority;
     const int64_t affinity;
     const Miner *miner;
diff --git a/src/backend/cpu/CpuWorker.cpp b/src/backend/cpu/CpuWorker.cpp
index 7584b6867..2e223a31e 100644
--- a/src/backend/cpu/CpuWorker.cpp
+++ b/src/backend/cpu/CpuWorker.cpp
@@ -58,6 +58,7 @@ xmrig::CpuWorker<N>::CpuWorker(size_t id, const CpuLaunchData &data) :
     m_algorithm(data.algorithm),
     m_assembly(data.assembly),
     m_hwAES(data.hwAES),
+    m_yield(data.yield),
     m_av(data.av()),
     m_miner(data.miner),
     m_ctx()
@@ -236,6 +237,10 @@ void xmrig::CpuWorker<N>::start()
             }
 
             m_count += N;
+
+            if (m_yield) {
+                std::this_thread::yield();
+            }
         }
 
         consumeJob();
diff --git a/src/backend/cpu/CpuWorker.h b/src/backend/cpu/CpuWorker.h
index 31819de97..11aba0478 100644
--- a/src/backend/cpu/CpuWorker.h
+++ b/src/backend/cpu/CpuWorker.h
@@ -71,6 +71,7 @@ private:
     const Algorithm m_algorithm;
     const Assembly m_assembly;
     const bool m_hwAES;
+    const bool m_yield;
     const CnHash::AlgoVariant m_av;
     const Miner *m_miner;
     cryptonight_ctx *m_ctx[N];
diff --git a/src/base/api/Api.cpp b/src/base/api/Api.cpp
index c66241c9c..c4b2c5a7d 100644
--- a/src/base/api/Api.cpp
+++ b/src/base/api/Api.cpp
@@ -31,10 +31,11 @@
 #endif
 
 
-#include "3rdparty/http-parser/http_parser.h"
 #include "base/api/Api.h"
+#include "3rdparty/http-parser/http_parser.h"
 #include "base/api/interfaces/IApiListener.h"
 #include "base/api/requests/HttpApiRequest.h"
+#include "base/io/json/Json.h"
 #include "base/kernel/Base.h"
 #include "base/tools/Buffer.h"
 #include "base/tools/Chrono.h"
@@ -73,9 +74,10 @@ static rapidjson::Value getResources(rapidjson::Document &doc)
 
     double loadavg[3] = { 0.0 };
     uv_loadavg(loadavg);
-    load_average.PushBack(loadavg[0], allocator);
-    load_average.PushBack(loadavg[1], allocator);
-    load_average.PushBack(loadavg[2], allocator);
+
+    for (double value : loadavg) {
+        load_average.PushBack(Json::normalize(value, true), allocator);
+    }
 
     out.AddMember("memory",               memory, allocator);
     out.AddMember("load_average",         load_average, allocator);
@@ -182,6 +184,9 @@ void xmrig::Api::exec(IApiRequest &request)
 #       endif
 #       ifdef XMRIG_FEATURE_OPENCL
         features.PushBack("opencl", allocator);
+#       endif
+#       ifdef XMRIG_FEATURE_CUDA
+        features.PushBack("cuda", allocator);
 #       endif
         reply.AddMember("features", features, allocator);
     }
diff --git a/src/base/io/json/Json.cpp b/src/base/io/json/Json.cpp
index 9a5782933..738621448 100644
--- a/src/base/io/json/Json.cpp
+++ b/src/base/io/json/Json.cpp
@@ -28,6 +28,7 @@
 
 
 #include <cassert>
+#include <cmath>
 
 
 namespace xmrig {
@@ -154,6 +155,18 @@ unsigned xmrig::Json::getUint(const rapidjson::Value &obj, const char *key, unsi
 }
 
 
+rapidjson::Value xmrig::Json::normalize(double value, bool zero)
+{
+    using namespace rapidjson;
+
+    if (!std::isnormal(value)) {
+        return zero ? Value(0.0) : Value(kNullType);
+    }
+
+    return Value(floor(value * 100.0) / 100.0);
+}
+
+
 bool xmrig::JsonReader::isEmpty() const
 {
     return !m_obj.IsObject() || m_obj.ObjectEmpty();
diff --git a/src/base/io/json/Json.h b/src/base/io/json/Json.h
index 80fe5dc26..b5e2a3c8a 100644
--- a/src/base/io/json/Json.h
+++ b/src/base/io/json/Json.h
@@ -48,6 +48,8 @@ public:
 
     static bool get(const char *fileName, rapidjson::Document &doc);
     static bool save(const char *fileName, const rapidjson::Document &doc);
+
+    static rapidjson::Value normalize(double value, bool zero);
 };
 
 
diff --git a/src/base/kernel/Base.cpp b/src/base/kernel/Base.cpp
index 90c7cb57c..5718a115e 100644
--- a/src/base/kernel/Base.cpp
+++ b/src/base/kernel/Base.cpp
@@ -176,10 +176,6 @@ int xmrig::Base::init()
 
     Platform::init(config()->userAgent());
 
-#   ifndef XMRIG_PROXY_PROJECT
-    Platform::setProcessPriority(config()->cpu().priority());
-#   endif
-
     if (isBackground()) {
         Log::background = true;
     }
diff --git a/src/base/kernel/Platform.h b/src/base/kernel/Platform.h
index 3f026f8bd..fe39a69ea 100644
--- a/src/base/kernel/Platform.h
+++ b/src/base/kernel/Platform.h
@@ -51,7 +51,6 @@ public:
     static uint32_t setTimerResolution(uint32_t resolution);
     static void init(const char *userAgent);
     static void restoreTimerResolution();
-    static void setProcessPriority(int priority);
     static void setThreadPriority(int priority);
 
     static inline const char *userAgent() { return m_userAgent; }
diff --git a/src/base/kernel/Platform_mac.cpp b/src/base/kernel/Platform_mac.cpp
index 146dd52d7..8d9bac3b8 100644
--- a/src/base/kernel/Platform_mac.cpp
+++ b/src/base/kernel/Platform_mac.cpp
@@ -83,11 +83,6 @@ void xmrig::Platform::restoreTimerResolution()
 }
 
 
-void xmrig::Platform::setProcessPriority(int priority)
-{
-}
-
-
 void xmrig::Platform::setThreadPriority(int priority)
 {
     if (priority == -1) {
diff --git a/src/base/kernel/Platform_unix.cpp b/src/base/kernel/Platform_unix.cpp
index bbba39f90..b6ca17e4a 100644
--- a/src/base/kernel/Platform_unix.cpp
+++ b/src/base/kernel/Platform_unix.cpp
@@ -111,11 +111,6 @@ void xmrig::Platform::restoreTimerResolution()
 }
 
 
-void xmrig::Platform::setProcessPriority(int priority)
-{
-}
-
-
 void xmrig::Platform::setThreadPriority(int priority)
 {
     if (priority == -1) {
diff --git a/src/base/kernel/Platform_win.cpp b/src/base/kernel/Platform_win.cpp
index 064c8352f..ad93cb6a7 100644
--- a/src/base/kernel/Platform_win.cpp
+++ b/src/base/kernel/Platform_win.cpp
@@ -131,43 +131,6 @@ void xmrig::Platform::restoreTimerResolution()
 }
 
 
-void xmrig::Platform::setProcessPriority(int priority)
-{
-    if (priority == -1) {
-        return;
-    }
-
-    DWORD prio = IDLE_PRIORITY_CLASS;
-    switch (priority)
-    {
-    case 1:
-        prio = BELOW_NORMAL_PRIORITY_CLASS;
-        break;
-
-    case 2:
-        prio = NORMAL_PRIORITY_CLASS;
-        break;
-
-    case 3:
-        prio = ABOVE_NORMAL_PRIORITY_CLASS;
-        break;
-
-    case 4:
-        prio = HIGH_PRIORITY_CLASS;
-        break;
-
-    case 5:
-        prio = REALTIME_PRIORITY_CLASS;
-        break;
-
-    default:
-        break;
-    }
-
-    SetPriorityClass(GetCurrentProcess(), prio);
-}
-
-
 void xmrig::Platform::setThreadPriority(int priority)
 {
     if (priority == -1) {
diff --git a/src/base/kernel/interfaces/IConfig.h b/src/base/kernel/interfaces/IConfig.h
index 5044545a5..dbbf82cd9 100644
--- a/src/base/kernel/interfaces/IConfig.h
+++ b/src/base/kernel/interfaces/IConfig.h
@@ -92,6 +92,7 @@ public:
         RandomXModeKey       = 1029,
         CPUMaxThreadsKey     = 1026,
         MemoryPoolKey        = 1027,
+        YieldKey             = 1030,
 
         // xmrig amd
         OclPlatformKey       = 1400,
diff --git a/src/config.json b/src/config.json
index fbbf8225b..df366c0ff 100644
--- a/src/config.json
+++ b/src/config.json
@@ -25,6 +25,7 @@
         "hw-aes": null,
         "priority": null,
         "memory-pool": false,
+        "yield": true,
         "max-threads-hint": 100,
         "asm": true,
         "argon2-impl": null,
diff --git a/src/core/Miner.cpp b/src/core/Miner.cpp
index 20ff3fd73..5551268a6 100644
--- a/src/core/Miner.cpp
+++ b/src/core/Miner.cpp
@@ -263,6 +263,11 @@ public:
 xmrig::Miner::Miner(Controller *controller)
     : d_ptr(new MinerPrivate(controller))
 {
+    const int priority = controller->config()->cpu().priority();
+    if (priority >= 0) {
+        Platform::setThreadPriority(std::min(priority + 1, 5));
+    }
+
 #   ifdef XMRIG_ALGO_RANDOMX
     Rx::init(this);
 #   endif
diff --git a/src/core/config/ConfigTransform.cpp b/src/core/config/ConfigTransform.cpp
index 667d91174..b9f666789 100644
--- a/src/core/config/ConfigTransform.cpp
+++ b/src/core/config/ConfigTransform.cpp
@@ -147,7 +147,9 @@ void xmrig::ConfigTransform::transform(rapidjson::Document &doc, int key, const
 
     case IConfig::MemoryPoolKey: /* --cpu-memory-pool */
         return set(doc, kCpu, "memory-pool", static_cast<int64_t>(strtol(arg, nullptr, 10)));
-        break;
+
+    case IConfig::YieldKey: /* --cpu-no-yield */
+        return set(doc, kCpu, "yield", false);
 
 #   ifdef XMRIG_FEATURE_ASM
     case IConfig::AssemblyKey: /* --asm */
diff --git a/src/core/config/Config_default.h b/src/core/config/Config_default.h
index afd3638bb..3db93a82f 100644
--- a/src/core/config/Config_default.h
+++ b/src/core/config/Config_default.h
@@ -50,6 +50,7 @@ R"===(
     "colors": true,
     "randomx": {
         "init": -1,
+        "mode": "auto",
         "numa": true
     },
     "cpu": {
@@ -58,6 +59,7 @@ R"===(
         "hw-aes": null,
         "priority": null,
         "memory-pool": false,
+        "yield": true,
         "max-threads-hint": 100,
         "asm": true,
         "argon2-impl": null,
diff --git a/src/core/config/Config_platform.h b/src/core/config/Config_platform.h
index 608ac48ee..a866c128c 100644
--- a/src/core/config/Config_platform.h
+++ b/src/core/config/Config_platform.h
@@ -86,6 +86,7 @@ static const option options[] = {
     { "max-cpu-usage",         1, nullptr, IConfig::CPUMaxThreadsKey      },
     { "cpu-max-threads-hint",  1, nullptr, IConfig::CPUMaxThreadsKey      },
     { "cpu-memory-pool",       1, nullptr, IConfig::MemoryPoolKey         },
+    { "cpu-no-yield",          0, nullptr, IConfig::YieldKey              },
 #   ifdef XMRIG_FEATURE_TLS
     { "tls",                   0, nullptr, IConfig::TlsKey                },
     { "tls-fingerprint",       1, nullptr, IConfig::FingerprintKey        },
diff --git a/src/core/config/usage.h b/src/core/config/usage.h
index dcae30f4a..38a487010 100644
--- a/src/core/config/usage.h
+++ b/src/core/config/usage.h
@@ -80,6 +80,7 @@ static inline const std::string &usage()
     u += "      --cpu-priority            set process priority (0 idle, 2 normal to 5 highest)\n";
     u += "      --cpu-max-threads-hint=N  maximum CPU threads count (in percentage) hint for autoconfig\n";
     u += "      --cpu-memory-pool=N       number of 2 MB pages for persistent memory pool, -1 (auto), 0 (disable)\n";
+    u += "      --cpu-no-yield            prefer maximum hashrate rather than system response/stability\n";
     u += "      --no-huge-pages           disable huge pages support\n";
     u += "      --asm=ASM                 ASM optimizations, possible values: auto, none, intel, ryzen, bulldozer\n";
 
diff --git a/src/crypto/common/VirtualMemory_hwloc.cpp b/src/crypto/common/VirtualMemory_hwloc.cpp
index 6ccc0c23e..e9e23aa9d 100644
--- a/src/crypto/common/VirtualMemory_hwloc.cpp
+++ b/src/crypto/common/VirtualMemory_hwloc.cpp
@@ -43,9 +43,6 @@ uint32_t xmrig::VirtualMemory::bindToNUMANode(int64_t affinity)
     auto cpu       = static_cast<HwlocCpuInfo *>(Cpu::info());
     hwloc_obj_t pu = hwloc_get_pu_obj_by_os_index(cpu->topology(), static_cast<unsigned>(affinity));
 
-    char *buffer;
-    hwloc_bitmap_asprintf(&buffer, pu->cpuset);
-
     if (pu == nullptr || !cpu->membind(pu->nodeset)) {
         LOG_WARN("CPU #%02" PRId64 " warning: \"can't bind memory\"", affinity);
 
diff --git a/src/version.h b/src/version.h
index 1cbae1b0f..6e21c416e 100644
--- a/src/version.h
+++ b/src/version.h
@@ -28,7 +28,7 @@
 #define APP_ID        "xmrig"
 #define APP_NAME      "XMRig"
 #define APP_DESC      "XMRig miner"
-#define APP_VERSION   "5.1.0"
+#define APP_VERSION   "5.1.1-dev"
 #define APP_DOMAIN    "xmrig.com"
 #define APP_SITE      "www.xmrig.com"
 #define APP_COPYRIGHT "Copyright (C) 2016-2019 xmrig.com"
@@ -36,7 +36,7 @@
 
 #define APP_VER_MAJOR  5
 #define APP_VER_MINOR  1
-#define APP_VER_PATCH  0
+#define APP_VER_PATCH  1
 
 #ifdef _MSC_VER
 #   if (_MSC_VER >= 1920)