diff --git a/dlls/wined3d/resource.c b/dlls/wined3d/resource.c
index aeece1ab512..857750d6bd7 100644
--- a/dlls/wined3d/resource.c
+++ b/dlls/wined3d/resource.c
@@ -618,13 +618,22 @@ void *resource_offset_map_pointer(struct wined3d_resource *resource, unsigned in
 
 void wined3d_resource_memory_colour_fill(struct wined3d_resource *resource,
         const struct wined3d_map_desc *map, const struct wined3d_color *colour,
-        const struct wined3d_box *box)
+        const struct wined3d_box *box, bool full_subresource)
 {
     const struct wined3d_format *format = resource->format;
     unsigned int w, h, d, x, y, z, bpp;
     uint8_t *dst, *dst2;
     uint32_t c[4];
 
+    /* Fast and simple path for setting everything to zero. The C library's memset is
+     * more sophisticated than our code below. Also this works for block formats, which
+     * we still need to zero-initialize for newly created resources. */
+    if (full_subresource && !colour->r && !colour->g && !colour->b && !colour->a)
+    {
+        memset(map->data, 0, map->slice_pitch * box->back);
+        return;
+    }
+
     w = box->right - box->left;
     h = box->bottom - box->top;
     d = box->back - box->front;
diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 20a06b32d03..7d62af5b31f 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -1181,8 +1181,10 @@ static void surface_cpu_blt_colour_fill(struct wined3d_rendertarget_view *view,
     struct wined3d_context *context;
     struct wined3d_texture *texture;
     struct wined3d_bo_address data;
+    struct wined3d_box level_box;
     struct wined3d_map_desc map;
     struct wined3d_range range;
+    bool full_subresource;
     unsigned int level;
     DWORD map_binding;
 
@@ -1208,6 +1210,8 @@ static void surface_cpu_blt_colour_fill(struct wined3d_rendertarget_view *view,
 
     texture = texture_from_resource(view->resource);
     level = view->sub_resource_idx % texture->level_count;
+    wined3d_texture_get_level_box(texture_from_resource(view->resource), level, &level_box);
+    full_subresource = !memcmp(box, &level_box, sizeof(*box));
 
     map_binding = texture->resource.map_binding;
     if (!wined3d_texture_load_location(texture, view->sub_resource_idx, context, map_binding))
@@ -1220,7 +1224,7 @@ static void surface_cpu_blt_colour_fill(struct wined3d_rendertarget_view *view,
     range.offset = 0;
     range.size = texture->sub_resources[view->sub_resource_idx].size;
 
-    wined3d_resource_memory_colour_fill(view->resource, &map, colour, box);
+    wined3d_resource_memory_colour_fill(view->resource, &map, colour, box, full_subresource);
 
     wined3d_context_unmap_bo_address(context, &data, 1, &range);
     context_release(context);
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index ce4d7384066..dfb2d76c08a 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -4429,7 +4429,7 @@ BOOL wined3d_resource_prepare_sysmem(struct wined3d_resource *resource) DECLSPEC
 void wined3d_resource_update_draw_binding(struct wined3d_resource *resource) DECLSPEC_HIDDEN;
 void wined3d_resource_memory_colour_fill(struct wined3d_resource *resource,
         const struct wined3d_map_desc *map, const struct wined3d_color *colour,
-        const struct wined3d_box *box) DECLSPEC_HIDDEN;
+        const struct wined3d_box *box, bool full_subresource) DECLSPEC_HIDDEN;
 
 /* Tests show that the start address of resources is 32 byte aligned */
 #define RESOURCE_ALIGNMENT 16