diff --git a/src-input/duk_heap.h b/src-input/duk_heap.h
index 10d62d1c70..62eb002422 100644
--- a/src-input/duk_heap.h
+++ b/src-input/duk_heap.h
@@ -144,7 +144,7 @@
 /* Slotcache is used to speeding up object property lookups without
  * caching a property value.
  */
-#define DUK_HEAP_SLOTCACHE_SIZE                           8192
+#define DUK_HEAP_SLOTCACHE_SIZE                           256
 
 /* helper to insert a (non-string) heap object into heap allocated list */
 #define DUK_HEAP_INSERT_INTO_HEAP_ALLOCATED(heap,hdr)     duk_heap_insert_into_heap_allocated((heap),(hdr))
@@ -533,8 +533,10 @@ DUK_INTERNAL void duk_heap_strtable_dump(duk_heap *heap);
 DUK_INTERNAL_DECL void duk_heap_strcache_string_remove(duk_heap *heap, duk_hstring *h);
 DUK_INTERNAL_DECL duk_uint_fast32_t duk_heap_strcache_offset_char2byte(duk_hthread *thr, duk_hstring *h, duk_uint_fast32_t char_offset);
 
+/* FIXME: duk_small_uint_t? */
 DUK_INTERNAL_DECL duk_uint32_t duk_heap_slotcache_lookup(duk_heap *heap, duk_hobject *obj, duk_hstring *key);
 DUK_INTERNAL_DECL void duk_heap_slotcache_insert(duk_heap *heap, duk_hobject *obj, duk_hstring *key, duk_uint32_t slot);
+DUK_INTERNAL_DECL duk_uint32_t duk_heap_slotcache_getkey(duk_hobject *obj, duk_hstring *key);
 
 #if defined(DUK_USE_PROVIDE_DEFAULT_ALLOC_FUNCTIONS)
 DUK_INTERNAL_DECL void *duk_default_alloc_function(void *udata, duk_size_t size);
diff --git a/src-input/duk_heap_slotcache.c b/src-input/duk_heap_slotcache.c
index 6390949238..fd50a6fe2d 100644
--- a/src-input/duk_heap_slotcache.c
+++ b/src-input/duk_heap_slotcache.c
@@ -4,6 +4,24 @@
 
 #include "duk_internal.h"
 
+/* FIXME: check if it's useful to compute the slotcache key only once in property code
+ * (live range is not trivial so maybe not).
+ */
+
+DUK_LOCAL DUK_ALWAYS_INLINE duk_uint32_t duk__slotcache_compute_key(duk_hobject *obj, duk_hstring *key) {
+	DUK_ASSERT(obj != NULL);
+	DUK_ASSERT(key != NULL);
+
+	return (((duk_uint32_t) obj) ^ DUK_HSTRING_GET_HASH(key)) & (DUK_HEAP_SLOTCACHE_SIZE - 1);
+}
+
+DUK_INTERNAL duk_uint32_t duk_heap_slotcache_getkey(duk_hobject *obj, duk_hstring *key) {
+	DUK_ASSERT(obj != NULL);
+	DUK_ASSERT(key != NULL);
+
+	return duk__slotcache_compute_key(obj, key);
+}
+
 DUK_INTERNAL duk_uint32_t duk_heap_slotcache_lookup(duk_heap *heap, duk_hobject *obj, duk_hstring *key) {
 	duk_uint32_t idx;
 	duk_slotcache_entry *ent;
@@ -14,8 +32,8 @@ DUK_INTERNAL duk_uint32_t duk_heap_slotcache_lookup(duk_heap *heap, duk_hobject
 
 	/* FIXME: assert: hashlimit <= 256 */
 
-	idx = ((duk_uint32_t) obj) ^ DUK_HSTRING_GET_HASH(key);
-	ent = heap->slotcache + (idx & (DUK_HEAP_SLOTCACHE_SIZE - 1));
+	idx = duk__slotcache_compute_key(obj, key);
+	ent = heap->slotcache + idx;
 	return ent->slot;
 }
 
@@ -25,10 +43,10 @@ DUK_INTERNAL void duk_heap_slotcache_insert(duk_heap *heap, duk_hobject *obj, du
 
 	/* FIXME: assert: hashlimit <= 256 */
 	/* FIXME: skip check if hash part present and hashlimit correct */
-	if (DUK_UNLIKELY(slot >= DUK_UINT16_MAX)) {
+	if (DUK_UNLIKELY(slot >= DUK_UINT8_MAX)) {
 		return;
 	}
-	idx = ((duk_uint32_t) obj) ^ DUK_HSTRING_GET_HASH(key);
-	ent = heap->slotcache + (idx & (DUK_HEAP_SLOTCACHE_SIZE - 1));
+	idx = duk__slotcache_compute_key(obj, key);
+	ent = heap->slotcache + idx;
 	ent->slot = (duk_uint16_t) slot;
 }
diff --git a/src-input/duk_hobject_props.c b/src-input/duk_hobject_props.c
index 03dfd6b44e..25c3405b7d 100644
--- a/src-input/duk_hobject_props.c
+++ b/src-input/duk_hobject_props.c
@@ -1182,7 +1182,9 @@ DUK_INTERNAL void duk_hobject_find_existing_entry(duk_heap *heap, duk_hobject *o
 		slot = duk_heap_slotcache_lookup(heap, obj, key);
 		if (slot < DUK_HOBJECT_GET_ENEXT(obj)) {
 			if (DUK_HOBJECT_E_GET_KEY(heap, obj, slot) == key) {
-				DUK_D(DUK_DPRINT("slot cache hit: %p %p -> %ld", (void *) obj, (void *) key, (long) slot));
+				DUK_D(DUK_DPRINT("slot cache hit: %p %p %!O -> %ld (slotcache lookup key %lu)",
+				                 (void *) obj, (void *) key, key, (long) slot,
+				                 (unsigned long) duk_heap_slotcache_getkey(obj, key)));
 				*e_idx = slot;
 				*h_idx = -1;
 				return;
@@ -1193,7 +1195,9 @@ DUK_INTERNAL void duk_hobject_find_existing_entry(duk_heap *heap, duk_hobject *o
 		n = DUK_HOBJECT_GET_ENEXT(obj);
 		for (i = 0; i < n; i++) {
 			if (h_keys_base[i] == key) {
-				DUK_D(DUK_DPRINT("slot cache insert: %p %p -> %ld", (void *) obj, (void *) key, (long) i));
+				DUK_D(DUK_DPRINT("slot cache insert: %p %p %!O -> %ld (slotcache lookup key %lu)",
+				                 (void *) obj, (void *) key, key, (long) i,
+				                 (unsigned long) duk_heap_slotcache_getkey(obj, key)));
 				duk_heap_slotcache_insert(heap, obj, key, i);
 				*e_idx = i;
 				*h_idx = -1;