diff --git a/cmdline/scan.c b/cmdline/scan.c
index 54e9cde9..fd55ae0c 100644
--- a/cmdline/scan.c
+++ b/cmdline/scan.c
@@ -2009,19 +2009,18 @@ static int state_diffscan(struct snapraid_state* state, int is_diff)
 	no_difference = !total.count_move && !total.count_copy && !total.count_restore
 		&& !total.count_change && !total.count_remove && !total.count_insert;
 
-	int parity_invalid = state->parity_is_invalid;
 	if (is_diff) {
 		if (!no_difference) {
 			msg_status("There are differences!\n");
 		} else {
 			msg_status("No differences\n");
 		}
-		if (parity_invalid)
+		if (state->unsynced_blocks != 0)
 			log_error(EUSER, "The last sync was interrupted. Run it again!\n");
 	}
 
-	if (parity_invalid) {
-		log_tag("summary:exit:incomplete_sync\n");
+	if (state->unsynced_blocks != 0) {
+		log_tag("summary:exit:unsynced\n");
 	} else if (!no_difference) {
 		log_tag("summary:exit:diff\n");
 	} else {
@@ -2040,7 +2039,7 @@ static int state_diffscan(struct snapraid_state* state, int is_diff)
 			return 1;
 
 		/* check also for incomplete "sync" */
-		if (parity_invalid)
+		if (state->unsynced_blocks != 0)
 			return 1;
 	}
 
diff --git a/cmdline/state.c b/cmdline/state.c
index 7391e292..7952631a 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -181,7 +181,7 @@ void state_init(struct snapraid_state* state)
 	state->no_conf = 0;
 	for (i = 0; i < SMART_IGNORE_MAX; ++i)
 		state->smartignore[i] = 0;
-	state->parity_is_invalid = 0;
+	state->unsynced_blocks = 0;
 	state->thermal_stop_gathering = 0;
 	state->thermal_ambient_temperature = 0;
 	state->thermal_highest_temperature = 0;
@@ -3129,8 +3129,8 @@ static void state_read_content(struct snapraid_state* state, const char* path, S
 	log_tag("content_info:block_unsynced:%u\n", count_unsynced);
 	log_tag("content_info:block_unscrubbed:%u\n", count_unscrubbed);
 
-	/* set the parity validity */
-	state->parity_is_invalid = count_unsynced != 0;
+	/* store the unsynced_blocks */
+	state->unsynced_blocks = count_unsynced;
 }
 
 struct state_write_thread_context {
@@ -4020,8 +4020,8 @@ static void state_write_content(struct snapraid_state* state, uint32_t* out_crc)
 	log_tag("content_info:block_unsynced:%u\n", count_unsynced);
 	log_tag("content_info:block_unscrubbed:%u\n", count_unscrubbed);
 
-	/* set the parity validity */
-	state->parity_is_invalid = count_unsynced != 0;
+	/* store the unsynced_blocks */
+	state->unsynced_blocks = count_unsynced;
 
 	*out_crc = crc;
 }
diff --git a/cmdline/state.h b/cmdline/state.h
index a2448af3..c0cc8c4d 100644
--- a/cmdline/state.h
+++ b/cmdline/state.h
@@ -142,7 +142,7 @@ struct snapraid_state {
 	unsigned besthash; /**< Best hash suggested. */
 	const char* command; /**< Command running. */
 	int smartignore[SMART_IGNORE_MAX]; /**< Smart attributes to ignore for all devices. */
-	int parity_is_invalid; /**< If the parity is invalid, and a sync is needed. */
+	uint32_t unsynced_blocks; /**< If the parity is invalid, and a sync is needed. */
 
 	tommy_list contentlist; /**< List of content files. */
 	tommy_list disklist; /**< List of all the disks. */
diff --git a/cmdline/status.c b/cmdline/status.c
index bf475771..7938b93f 100644
--- a/cmdline/status.c
+++ b/cmdline/status.c
@@ -72,7 +72,6 @@ int state_status(struct snapraid_state* state)
 	uint64_t file_block_count;
 	uint64_t file_block_free;
 	block_off_t parity_block_free;
-	unsigned unsynced_blocks;
 	unsigned unscrubbed_blocks;
 	uint64_t all_wasted;
 	int free_not_zero;
@@ -297,7 +296,6 @@ int state_status(struct snapraid_state* state)
 	bad_last = 0;
 	count = 0;
 	rehash = 0;
-	unsynced_blocks = 0;
 	unscrubbed_blocks = 0;
 	log_tag("block_count:%u\n", blockmax);
 	for (i = 0; i < blockmax; ++i) {
@@ -309,19 +307,17 @@ int state_status(struct snapraid_state* state)
 		/* for each disk */
 		one_invalid = 0;
 		one_valid = 0;
-		for (node_disk = state->disklist; node_disk != 0; node_disk = node_disk->next) {
-			struct snapraid_disk* disk = node_disk->data;
-			struct snapraid_block* block = fs_par2block_find(disk, i);
 
-			if (block_has_file(block))
-				one_valid = 1;
-			if (block_has_invalid_parity(block))
-				one_invalid = 1;
-		}
+		if (state->opt.gui_verbose) { /* avoid this time consuming operation if not needed */
+			for (node_disk = state->disklist; node_disk != 0; node_disk = node_disk->next) {
+				struct snapraid_disk* disk = node_disk->data;
+				struct snapraid_block* block = fs_par2block_find(disk, i);
 
-		/* if both valid and invalid, we need to update */
-		if (one_invalid && one_valid) {
-			++unsynced_blocks;
+				if (block_has_file(block))
+					one_valid = 1;
+				if (block_has_invalid_parity(block))
+					one_invalid = 1;
+			}
 		}
 
 		/* skip unused blocks */
@@ -367,7 +363,7 @@ int state_status(struct snapraid_state* state)
 	}
 
 	/* sort the info to get the time info */
-	qsort(timemap, count, sizeof(time_t), time_compare);
+	sort_time(timemap, count);
 
 	/* output the info map */
 	i = 0;
@@ -477,9 +473,9 @@ int state_status(struct snapraid_state* state)
 		printf("WARNING! You have scrub dates in the future! The next sync/scrub will truncate them!\n");
 	}
 
-	if (unsynced_blocks) {
+	if (state->unsynced_blocks) {
 		printf("WARNING! The array is NOT fully synced.\n");
-		printf("You have a sync in progress at %u%%.\n", muldiv(blockmax - unsynced_blocks, 100, blockmax));
+		printf("You have a sync in progress at %u%%.\n", muldiv(blockmax - state->unsynced_blocks, 100, blockmax));
 	} else {
 		printf("No sync is in progress.\n");
 	}
@@ -573,7 +569,7 @@ int state_status(struct snapraid_state* state)
 
 	if (bad)
 		log_tag("summary:exit:bad\n");
-	else if (unsynced_blocks)
+	else if (state->unsynced_blocks != 0)
 		log_tag("summary:exit:unsynced\n");
 	else
 		log_tag("summary:exit:ok\n");
diff --git a/cmdline/util.c b/cmdline/util.c
index 8f5e4779..56801f5f 100644
--- a/cmdline/util.c
+++ b/cmdline/util.c
@@ -854,3 +854,99 @@ unsigned muldiv_upper(uint64_t v, uint64_t mul, uint64_t div)
 	return (uint32_t)((v * mul + div - 1) / div);
 }
 
+/****************************************************************************/
+/* sort */
+
+/**
+ * Three-way partition for quicksort
+ * Partitions array into three parts: < pivot, == pivot, > pivot
+ * Returns the boundaries of the equal section via lt and gt pointers
+ */
+static void partition3way(time_t *arr, size_t left, size_t right, size_t *lt, size_t *gt)
+{
+	/* choose median-of-three as pivot to avoid worst case on sorted data */
+	size_t mid = left + (right - left) / 2;
+	time_t pivot;
+
+	/* sort left, mid, right and use median as pivot */
+	if (arr[left] > arr[mid]) {
+		uint64_t tmp = arr[left]; arr[left] = arr[mid]; arr[mid] = tmp;
+	}
+	if (arr[mid] > arr[right]) {
+		uint64_t tmp = arr[mid]; arr[mid] = arr[right]; arr[right] = tmp;
+		if (arr[left] > arr[mid]) {
+			tmp = arr[left]; arr[left] = arr[mid]; arr[mid] = tmp;
+		}
+	}
+	pivot = arr[mid];
+
+	// Dutch National Flag partition
+	size_t i = left;
+	size_t lt_idx = left;
+	size_t gt_idx = right;
+
+	while (i <= gt_idx) {
+		if (arr[i] < pivot) {
+			uint64_t tmp = arr[lt_idx];
+			arr[lt_idx] = arr[i];
+			arr[i] = tmp;
+			lt_idx++;
+			i++;
+		} else if (arr[i] > pivot) {
+			uint64_t tmp = arr[i];
+			arr[i] = arr[gt_idx];
+			arr[gt_idx] = tmp;
+			gt_idx--;
+		} else {
+			i++;
+		}
+	}
+
+	*lt = lt_idx;
+	*gt = gt_idx;
+}
+
+/**
+ * Recursive three-way quicksort
+ */
+static void quicksort3way_recursive(time_t *arr, size_t left, size_t right)
+{
+	if (left >= right)
+		return;
+
+	/* use insertion sort for small subarrays (optimization) */
+	if (right - left < 16) {
+		for (size_t i = left + 1; i <= right; i++) {
+			time_t key = arr[i];
+			size_t j = i;
+			while (j > left && arr[j - 1] > key) {
+				arr[j] = arr[j - 1];
+				j--;
+			}
+			arr[j] = key;
+		}
+		return;
+	}
+
+	size_t lt, gt;
+	partition3way(arr, left, right, &lt, &gt);
+
+	/*
+	 * Recursively sort elements less than and greater than pivot
+	 * Elements equal to pivot are already in correct position
+	 */
+	if (lt > left) {
+		quicksort3way_recursive(arr, left, lt - 1);
+	}
+	if (gt < right) {
+		quicksort3way_recursive(arr, gt + 1, right);
+	}
+}
+
+void sort_time(time_t *arr, size_t n)
+{
+	if (n <= 1)
+		return;
+	quicksort3way_recursive(arr, 0, n - 1);
+}
+
diff --git a/cmdline/util.h b/cmdline/util.h
index 8705f904..97cc0307 100644
--- a/cmdline/util.h
+++ b/cmdline/util.h
@@ -273,5 +273,17 @@ static inline int bit_vect_test(bit_vect_t* bit_vect, size_t off)
 unsigned muldiv(uint64_t v, uint64_t mul, uint64_t div);
 unsigned muldiv_upper(uint64_t v, uint64_t mul, uint64_t div);
 
+/****************************************************************************/
+/* sort */
+
+/**
+ * Sort an array of uint64_t integers in-place
+ * Optimized for arrays with many duplicate values
+ *
+ * @param arr    Pointer to array of uint64_t
+ * @param n      Number of elements in the array
+ */
+void sort_time(time_t* arr, size_t n);
+
 #endif
 
diff --git a/doc/snapraid_log.1 b/doc/snapraid_log.1
index aee43c53..336aaacc 100644
--- a/doc/snapraid_log.1
+++ b/doc/snapraid_log.1
@@ -484,6 +484,10 @@ The array is already synchronized.
 .I diff
 Indicates that differences were found.
 The array needs a \`sync\` operation.
+.HP 4
+.I unsynced
+The array has an interrupted sync.
+The array needs another \`sync\` operation.
 .PD
 .RE
 .SH GENERAL PROGRESS AND EXECUTION TAGS 
diff --git a/doc/snapraid_log.d b/doc/snapraid_log.d
index e53e680f..2045c1de 100644
--- a/doc/snapraid_log.d
+++ b/doc/snapraid_log.d
@@ -330,6 +330,8 @@ Scan Tags
 			The array is already synchronized.
 		diff - Indicates that differences were found.
 			The array needs a `sync` operation.
+		unsynced - The array has an interrupted sync.
+			The array needs another `sync` operation.
 
 General Progress and Execution Tags
 	These tags are used to report the runtime processing of the commands
diff --git a/doc/snapraid_log.txt b/doc/snapraid_log.txt
index e6566afd..da7a5b67 100644
--- a/doc/snapraid_log.txt
+++ b/doc/snapraid_log.txt
@@ -346,6 +346,8 @@ These tags provide a final count of all detected changes.
         The array is already synchronized.
     diff - Indicates that differences were found.
         The array needs a `sync` operation.
+    unsynced - The array has an interrupted sync.
+        The array needs another `sync` operation.
 
 
 6 GENERAL PROGRESS AND EXECUTION TAGS