diff --git a/cpp/cmp_memcpy.hpp b/cpp/cmp_memcpy.hpp
new file mode 100644
index 0000000..955508b
--- /dev/null
+++ b/cpp/cmp_memcpy.hpp
@@ -0,0 +1,169 @@
+// Copyright (C) 2023 RozK
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef RK_ENGINE_CMP_MEMCPY_H
+#define RK_ENGINE_CMP_MEMCPY_H
+
+#include "types.hpp"
+
+template<typename _type>
+bool _rk_cmp_memcpy_small(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+    unsigned count = (size / sizeof(_type));
+    _type * dst = reinterpret_cast<_type *>(_dst);
+    _type const * src = reinterpret_cast<_type const *>(_src);
+    _type cmp = 0;
+    do {
+        cmp |= *dst ^ *src;
+        *dst++ = *src++;
+    } while(--count > 0);
+    return (cmp != 0);
+}
+
+template<typename _big, typename _small>
+bool _rk_cmp_memcpy_big(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+    unsigned count = size / sizeof(_big);
+    unsigned const remain = size % sizeof(_big);
+    _big * dst = reinterpret_cast<_big *>(_dst);
+    _big const * src = reinterpret_cast<_big const *>(_src);
+    _big cmp = 0;
+    do {
+        cmp |= *dst ^ *src;
+        *dst++ = *src++;
+    } while(--count > 0);
+    bool modified = (cmp != 0);
+    if (remain) {
+        modified |= _rk_cmp_memcpy_small<_small>(dst, src, remain);
+    }
+    return modified;
+}
+
+#ifdef RK_CMP_MEMCPY_UNALIGNED
+#define _rk_size_and_alignment(_t) (size >= sizeof(_t))
+#else
+#define _rk_size_and_alignment(_t) (size >= sizeof(_t) && !(alignment & (sizeof(_t) - 1)))
+#endif
+
+template<unsigned _s>
+bool rk_cmp_memcpy(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size);
+
+template<>
+bool rk_cmp_memcpy<sizeof(rk_ubyte)>(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+#ifndef RK_CMP_MEMCPY_UNALIGNED
+    unsigned const alignment = reinterpret_cast<uintptr_t>(_dst) | reinterpret_cast<uintptr_t const>(_src);
+#endif
+    if (_rk_size_and_alignment(rk_ullong)) {
+        return _rk_cmp_memcpy_big<rk_ullong, rk_ubyte>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_ulong)) {
+        return _rk_cmp_memcpy_big<rk_ulong, rk_ubyte>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_uint)) {
+        return _rk_cmp_memcpy_big<rk_uint, rk_ubyte>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_ushort)) {
+        return _rk_cmp_memcpy_big<rk_ushort, rk_ubyte>(_dst, _src, size);
+    }
+    if (size > 0) {
+        return _rk_cmp_memcpy_small<rk_ubyte>(_dst, _src, size);
+    }
+    return false;
+}
+
+template<>
+bool rk_cmp_memcpy<sizeof(rk_ushort)>(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+#ifndef RK_CMP_MEMCPY_UNALIGNED
+    unsigned const alignment = reinterpret_cast<uintptr_t>(_dst) | reinterpret_cast<uintptr_t const>(_src);
+#endif
+    if (_rk_size_and_alignment(rk_ullong)) {
+        return _rk_cmp_memcpy_big<rk_ullong, rk_ushort>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_ulong)) {
+        return _rk_cmp_memcpy_big<rk_ulong, rk_ushort>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_uint)) {
+        return _rk_cmp_memcpy_big<rk_uint, rk_ushort>(_dst, _src, size);
+    }
+    if (size > 0) {
+        return _rk_cmp_memcpy_small<rk_ushort>(_dst, _src, size);
+    }
+    return false;
+}
+
+template<>
+bool rk_cmp_memcpy<sizeof(rk_uint)>(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+#ifndef RK_CMP_MEMCPY_UNALIGNED
+    unsigned const alignment = reinterpret_cast<uintptr_t>(_dst) | reinterpret_cast<uintptr_t const>(_src);
+#endif
+    if (_rk_size_and_alignment(rk_ullong)) {
+        return _rk_cmp_memcpy_big<rk_ullong, rk_uint>(_dst, _src, size);
+    }
+    if (_rk_size_and_alignment(rk_ulong)) {
+        return _rk_cmp_memcpy_big<rk_ulong, rk_uint>(_dst, _src, size);
+    }
+    if (size > 0) {
+        return _rk_cmp_memcpy_small<rk_uint>(_dst, _src, size);
+    }
+    return false;
+}
+
+template<>
+bool rk_cmp_memcpy<sizeof(rk_ulong)>(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+#ifndef RK_CMP_MEMCPY_UNALIGNED
+    unsigned const alignment = reinterpret_cast<uintptr_t>(_dst) | reinterpret_cast<uintptr_t const>(_src);
+#endif
+    if (_rk_size_and_alignment(rk_ullong)) {
+        return _rk_cmp_memcpy_big<rk_ullong, rk_ulong>(_dst, _src, size);
+    }
+    if (size > 0) {
+        return _rk_cmp_memcpy_small<rk_ulong>(_dst, _src, size);
+    }
+    return false;
+}
+
+template<>
+bool rk_cmp_memcpy<sizeof(rk_ullong)>(
+    void * const __restrict _dst,
+    void const * const __restrict _src,
+    unsigned const size) {
+    if (size > 0) {
+        return _rk_cmp_memcpy_small<rk_ullong>(_dst, _src, size);
+    }
+    return false;
+}
+
+#undef _rk_size_and_alignment
+
+#endif // RK_ENGINE_CMP_MEMCPY_H
diff --git a/cpp/render/render_opengles.cpp b/cpp/render/render_opengles.cpp
index f56a815..15d5d24 100644
--- a/cpp/render/render_opengles.cpp
+++ b/cpp/render/render_opengles.cpp
@@ -18,6 +18,7 @@
 #include "../render.hpp"
 #include "render_opengles.hpp"
 #include "../display/display_glx.hpp"
+#include "../cmp_memcpy.hpp"
 #include <cstdlib>
 #include <cstdio>
 #include <cstring>
@@ -28,32 +29,6 @@ typedef void (*rk_MultiDrawElementsIndirectFunc)(rk_uint, rk_uint, const void *,
 static rk_DrawElementsInstancedBaseInstanceFunc rk_DrawElementsInstancedBaseInstance = nullptr;
 static rk_MultiDrawElementsIndirectFunc rk_MultiDrawElementsIndirect = nullptr;
 
-static bool rk_compare_replace(
-    void * __restrict _dst,
-    void const * __restrict _src,
-    unsigned const size) {
-    rk_ulong hash = 0;
-    rk_ulong * dst = reinterpret_cast<rk_ulong *>(_dst);
-    rk_ulong const * src = reinterpret_cast<rk_ulong const *>(_src);
-    unsigned count = size / sizeof(rk_ulong);
-    unsigned remain = (size - count * sizeof(rk_ulong));
-    if (count) {
-        do {
-            hash |= *dst ^ *src;
-            *dst++ = *src++;
-        } while(--count > 0);
-    }
-    if (remain) {
-        rk_ubyte * rdst = reinterpret_cast<rk_ubyte *>(dst);
-        rk_ubyte const * rsrc = reinterpret_cast<rk_ubyte const *>(src);
-        do {
-            hash |= *rdst ^ *rsrc;
-            *rdst++ = *rsrc++;
-        } while(--remain > 0);
-    }
-    return (hash != 0);
-}
-
 #ifdef RK_BUCKETS_SORT
 
 struct rk_bucket {
@@ -143,7 +118,7 @@ static bool rk_buckets_sort(
             command->base_index = mesh->base_index;
             command->base_vertex = 0;
             command->base_instance = indices - batch.indices;
-            modified |= rk_compare_replace(indices, bucket->indices, bucket->count * sizeof(rk_ushort));
+            modified |= rk_cmp_memcpy<sizeof(rk_ushort)>(indices, bucket->indices, bucket->count * sizeof(rk_ushort));
             indices += bucket->count;
             ++command;
         }
@@ -937,18 +912,19 @@ void rk_fill_batch(
         return;
     }
     batch->count = count;
-    bool const cmp_flags =
-        (flags && rk_compare_replace(batch->flags, flags, batch->count * sizeof(rk_instance_flags)));
-    bool const cmp_meshes =
-        (meshes && rk_compare_replace(batch->meshes, meshes, batch->count * sizeof(rk_mesh)));
+    bool const cmp_flags = (flags &&
+        rk_cmp_memcpy<sizeof(rk_ubyte)>(batch->flags, flags, batch->count * sizeof(rk_instance_flags)));
+    bool const cmp_meshes = (meshes &&
+        rk_cmp_memcpy<sizeof(rk_ushort)>(batch->meshes, meshes, batch->count * sizeof(rk_mesh)));
     bool const need_sorting = (cmp_flags || cmp_meshes || resized);
     if (batch->nparams) {
         rk_parameter const * const last_param = batch->params + batch->nparams;
         if (got_any_params) {
             rk_ubyte const * const * src = params;
             for (rk_parameter const * dst = batch->params; dst < last_param; ++dst, ++src) {
-                dst->dirty =
-                    (*src && rk_compare_replace(dst->source, *src, batch->count * dst->src_size)) || need_sorting;
+                dst->dirty = ((*src &&
+                    rk_cmp_memcpy<sizeof(rk_uint)>(dst->source, *src, batch->count * dst->src_size))
+                    || need_sorting);
             }
         } else if (need_sorting) {
             for (rk_parameter const * dst = batch->params; dst < last_param; ++dst) {
diff --git a/cpp/types.hpp b/cpp/types.hpp
index b5bd179..6ac3fbb 100644
--- a/cpp/types.hpp
+++ b/cpp/types.hpp
@@ -33,6 +33,8 @@ typedef int32_t rk_int;
 typedef uint32_t rk_uint;
 typedef int64_t rk_long;
 typedef uint64_t rk_ulong;
+typedef __int128 rk_llong;
+typedef unsigned __int128 rk_ullong;
 typedef float rk_float;
 typedef void * rk_handle_t;