diff --git a/build/Makefile b/build/Makefile
index 34d745f..e425dc0 100644
--- a/build/Makefile
+++ b/build/Makefile
@@ -1,5 +1,5 @@
 NVCC         := nvcc
-NVCC_FLAGS   := -rdc=true -O3 -use_fast_math -Xptxas -O3 \
+NVCC_FLAGS   := -rdc=true -O3 -Xptxas -O3 \
                 -gencode arch=compute_75,code=sm_75 \
                 --default-stream per-thread \
                 -Wno-deprecated-gpu-targets \
diff --git a/libs/ed25519.cu b/libs/ed25519.cu
index c8eae72..ee98511 100644
--- a/libs/ed25519.cu
+++ b/libs/ed25519.cu
@@ -94,6 +94,7 @@ __device__ __forceinline__ void ed25519_copy(struct ed25519_pt* dst, const struc
 }
 __device__ void ed25519_smult(struct ed25519_pt* r_out, const struct ed25519_pt* p, const unsigned char* e) {
     struct ed25519_pt r = ed25519_neutral;
+#pragma unroll 256
     for (int i = 255; i >= 0; i--) {
         struct ed25519_pt s;
         ed25519_double(&r, &r);
diff --git a/libs/sha512.cu b/libs/sha512.cu
index c7b0256..ef87985 100644
--- a/libs/sha512.cu
+++ b/libs/sha512.cu
@@ -66,7 +66,7 @@ __device__ __forceinline__ unsigned long rot64(unsigned long x, int bits) {
 }
 __device__ void sha512_block(sha512_state* s, const unsigned char* blk) {
     unsigned long w[16];
-#pragma unroll
+#pragma unroll 16
     for (int i = 0; i < 16; i++) {
         w[i] = load64(blk + i * 8);
     }
@@ -78,7 +78,7 @@ __device__ void sha512_block(sha512_state* s, const unsigned char* blk) {
     unsigned long f = s->h[5];
     unsigned long g = s->h[6];
     unsigned long h = s->h[7];
-#pragma unroll
+#pragma unroll 80
     for (int i = 0; i < 80; i++) {
         const int idx = i & 15;
         const int idx1 = (i + 1) & 15;
diff --git a/sources/main.cpp b/sources/main.cpp
index e7a96e9..98c38ce 100644
--- a/sources/main.cpp
+++ b/sources/main.cpp
@@ -59,6 +59,7 @@ inline std::string getAddress(const Address& rawAddr) noexcept {
 inline std::string KeyToString(const unsigned char* key) noexcept {
     char result[65];
     const char* hexDigits = "0123456789abcdef";
+#pragma unroll
     for (unsigned char i = 0; i < 32; i++) {
         result[2 * i] = hexDigits[key[i] >> 4];
         result[2 * i + 1] = hexDigits[key[i] & 0x0F];
@@ -109,7 +110,7 @@ inline void invertKey(const unsigned char* __restrict key, Key& inverted) noexce
     return static_cast<long long>(state * 2685821657736338717);
 }
 inline void rmbytes(unsigned char* __restrict buf, unsigned char size, unsigned long& state) noexcept {
-    for (unsigned char x = 0; x < size / 32; x++) {
+    for (unsigned char x = 0; x < 32; x++) {
         _mm256_store_si256((__m256i*) & buf[x * 32], _mm256_set_epi64x(xorshift64(state), xorshift64(state), xorshift64(state), xorshift64(state)));
     }
 }
diff --git a/sources/main.cu b/sources/main.cu
index d77563c..a156703 100644
--- a/sources/main.cu
+++ b/sources/main.cu
@@ -12,7 +12,7 @@ struct KeysBox {
     Key PublicKey;
     Key PrivateKey;
 };
-__device__ unsigned high = 0x10;
+__device__ unsigned d_high = 0x10;
 __device__ int parameters(const char* arg) {
     int space_index = cstring_find(arg, " ");
     if (space_index != -1) {
@@ -26,7 +26,7 @@ __device__ int parameters(const char* arg) {
             unsigned tmp_high;
             int ret = cstring_to_ull(sub_arg, &tmp_high);
             if (ret != 0) return 1;
-            high = tmp_high;
+            d_high = tmp_high;
             return 0;
         }
     }
@@ -63,19 +63,19 @@ struct ds46 {
 __device__ ds64 ktos(const unsigned char* key) noexcept {
     ds64 str;
     const char* hexDigits = "0123456789abcdef";
-#pragma unroll
+#pragma unroll 32
     for (unsigned char i = 0; i < 32; i++) {
         str.data[2 * i] = hexDigits[key[i] >> 4];
         str.data[2 * i + 1] = hexDigits[key[i] & 0x0F];
     }
-    str.data[64] = '\0';
+    str.data[65] = '\0';
     return str;
 }
 __device__ ds46 getAddr(const unsigned char rawAddr[16]) noexcept {
     ds46 addrStr;
     const char* hexDigits = "0123456789abcdef";
     unsigned pos = 0;
-#pragma unroll
+#pragma unroll 8
     for (unsigned char group = 0; group < 8; group++) {
         int idx = group * 2;
         addrStr.data[pos++] = hexDigits[rawAddr[idx] >> 4];
@@ -132,14 +132,12 @@ __device__ __forceinline__ unsigned long long xorshift128plus(unsigned long long
     state[1] = x;
     return x + y;
 }
-__device__ __forceinline__ void rmbytes(unsigned char* buf, unsigned long size, unsigned long long* state) {
-#pragma unroll
-    for (unsigned long i = 0; i < size; i++) {
-        buf[i] = static_cast<unsigned char>(xorshift128plus(state) & 0xFF);
-    }
+__device__ __forceinline__ void rmbytes(unsigned char* buf, unsigned long long* state) {
+#pragma unroll 32
+    for (unsigned long i = 0; i < 32; i++) buf[i] = static_cast<unsigned char>(xorshift128plus(state) & 0xFF);
 }
 __device__ __forceinline__ void invertKey(const unsigned char* key, unsigned char* inverted) {
-#pragma unroll
+#pragma unroll 32
     for (unsigned char i = 0; i < 32; i++) inverted[i] = key[i] ^ 0xFF;
 }
 __global__ void KeyGen(curandState* randStates) {
@@ -148,17 +146,16 @@ __global__ void KeyGen(curandState* randStates) {
     xorshiftState[0] = curand(&localState);
     xorshiftState[1] = curand(&localState);
     Key seed;
+    KeysBox keys;
     while (true) {
-        rmbytes(seed, sizeof(seed), xorshiftState);
-        KeysBox keys;
+        rmbytes(seed, xorshiftState);
         ed25519_keygen(keys.PrivateKey, keys.PublicKey, seed);
-        unsigned zeros = getZeros(keys.PublicKey);
-        if (zeros > atomicMax((unsigned*)&high, zeros)) {
+        if (unsigned zeros = getZeros(keys.PublicKey); zeros > atomicMax((unsigned*)&d_high, zeros)) {
             Address raw;
             Key inv;
             invertKey(keys.PublicKey, inv);
             getRawAddress(zeros, inv, raw);
-            printf("\nIPv6:\t%s\nPK:\t%s\nSK:\t%s\nFK:\t%s%s\n", getAddr(raw).data, ktos(keys.PublicKey).data, ktos(keys.PrivateKey).data, ktos(keys.PrivateKey).data, ktos(keys.PublicKey).data);
+            printf("\nIPv6:\t%s\nPK:\t%s\nSK:\t%s\n", getAddr(raw).data, ktos(keys.PublicKey).data, ktos(keys.PrivateKey).data);
         }
     }
 }
@@ -176,20 +173,17 @@ int main(int argc, char* argv[]) {
     }
     args<<<1, 1 >>>(d_argv, argc, d_result);
     unsigned h_high;
-    cudaMemcpyFromSymbol(&h_high, high, sizeof(unsigned));
+    cudaMemcpyFromSymbol(&h_high, d_high, sizeof(unsigned));
     printf("High addresses (2%02x+)\n", h_high);
-    const int threadsPerBlock = 256;
+    const int threadsPerBlock = 128;
     cudaDeviceProp prop;
     cudaGetDeviceProperties(&prop, 0);
     int mBpSM;
     cudaOccupancyMaxActiveBlocksPerMultiprocessor(&mBpSM, KeyGen, threadsPerBlock, 0);
-    int SMs = prop.multiProcessorCount;
-    int maxBlocks = mBpSM * SMs;
-    const int totalThreads = maxBlocks * threadsPerBlock;
-    printf("SMs: %d\n", SMs);
-    printf("maxBlocks: %d\n", maxBlocks);
-    printf("totalThreads: %d\n", totalThreads);
+    const int totalThreads = mBpSM * prop.multiProcessorCount * threadsPerBlock;
+    printf("SMs: %d\n", prop.multiProcessorCount);
     printf("MaxBlocksPerSM: %d\n", mBpSM);
+    printf("totalThreads: %d\n", totalThreads);
     printf("BlocksThreads: %d:%d\n", totalThreads / threadsPerBlock, threadsPerBlock);
     curandState* rst;
     cudaMalloc(&rst, totalThreads * sizeof(curandState));