diff --git a/src/mem/alloc.h b/src/mem/alloc.h
index bd7617125..c08ac2d6b 100644
--- a/src/mem/alloc.h
+++ b/src/mem/alloc.h
@@ -46,8 +46,10 @@ namespace snmalloc
 // Use flat map is under a single node.
 #  define SNMALLOC_MAX_FLATPAGEMAP_SIZE PAGEMAP_NODE_SIZE
 #endif
-  static constexpr bool USE_FLATPAGEMAP = SNMALLOC_MAX_FLATPAGEMAP_SIZE >=
-    sizeof(FlatPagemap<SUPERSLAB_BITS, uint8_t>);
+  static constexpr bool USE_FLATPAGEMAP =
+    (Pal::pal_features & PalFeatures::LazyCommit) ||
+    (SNMALLOC_MAX_FLATPAGEMAP_SIZE >=
+     sizeof(FlatPagemap<SUPERSLAB_BITS, uint8_t>));
 
   using SuperslabPagemap = std::conditional_t<
     USE_FLATPAGEMAP,
@@ -1152,6 +1154,8 @@ namespace snmalloc
     SNMALLOC_SLOW_PATH void small_dealloc_offseted_slow(
       Superslab* super, void* p, sizeclass_t sizeclass)
     {
+      handle_message_queue();
+
       bool was_full = super->is_full();
       SlabList* sl = &small_classes[sizeclass];
       Slab* slab = Slab::get(p);
diff --git a/src/pal/pal_apple.h b/src/pal/pal_apple.h
index 9e456d53e..97f72bb10 100644
--- a/src/pal/pal_apple.h
+++ b/src/pal/pal_apple.h
@@ -22,7 +22,7 @@ namespace snmalloc
      * Bitmap of PalFeatures flags indicating the optional features that this
      * PAL supports.
      */
-    static constexpr uint64_t pal_features = 0;
+    static constexpr uint64_t pal_features = LazyCommit;
     static void error(const char* const str)
     {
       puts(str);
diff --git a/src/pal/pal_consts.h b/src/pal/pal_consts.h
index e5e165dfd..40e50bb20 100644
--- a/src/pal/pal_consts.h
+++ b/src/pal/pal_consts.h
@@ -25,7 +25,13 @@ namespace snmalloc
      * a size and alignment.  A PAL that does *not* support it must expose a
      * `request()` method that takes only a size.
      */
-    AlignedAllocation = (1 << 1)
+    AlignedAllocation = (1 << 1),
+    /**
+     * This PAL natively supports lazy commit of pages. This means have large
+     * allocations and not touching them does not up memory usage.  This is
+     * exposed in the P
+     */
+    LazyCommit = (1 << 2),
   };
   /**
    * Flag indicating whether requested memory should be zeroed.
diff --git a/src/pal/pal_freebsd.h b/src/pal/pal_freebsd.h
index 8487f1919..d0e6bc664 100644
--- a/src/pal/pal_freebsd.h
+++ b/src/pal/pal_freebsd.h
@@ -17,7 +17,7 @@ namespace snmalloc
      * Bitmap of PalFeatures flags indicating the optional features that this
      * PAL supports.
      */
-    static constexpr uint64_t pal_features = AlignedAllocation;
+    static constexpr uint64_t pal_features = AlignedAllocation | LazyCommit;
     static void error(const char* const str)
     {
       puts(str);
diff --git a/src/pal/pal_linux.h b/src/pal/pal_linux.h
index b2af7428c..dcb75dd5a 100644
--- a/src/pal/pal_linux.h
+++ b/src/pal/pal_linux.h
@@ -18,7 +18,7 @@ namespace snmalloc
      * Bitmap of PalFeatures flags indicating the optional features that this
      * PAL supports.
      */
-    static constexpr uint64_t pal_features = 0;
+    static constexpr uint64_t pal_features = LazyCommit;
     static void error(const char* const str)
     {
       puts(str);