diff --git a/core/core.js b/core/core.js
index 76299d8b..163772cd 100644
--- a/core/core.js
+++ b/core/core.js
@@ -861,6 +861,10 @@ loadSettings().then(function() {
 			let data = JSON.stringify(getDebug(), null, 2);
 			response.writeHead(200, {"Content-Type": "application/json; charset=utf-8", "Content-Length": data.length.toString()});
 			return response.end(data);
+		} else if (match = /^\/hitches$/.exec(request.uri)) {
+			let data = JSON.stringify(getHitches(), null, 2);
+			response.writeHead(200, {"Content-Type": "application/json; charset=utf-8", "Content-Length": data.length.toString()});
+			return response.end(data);
 		} else if (match = /^\/mem$/.exec(request.uri)) {
 			let data = JSON.stringify(getAllocations(), null, 2);
 			response.writeHead(200, {
diff --git a/src/ssb.c b/src/ssb.c
index b1fcf1be..2b7fa1c8 100644
--- a/src/ssb.c
+++ b/src/ssb.c
@@ -41,6 +41,9 @@
 #define CYAN "\e[1;36m"
 #define RESET "\e[0m"
 
+#define PRE_CALLBACK(ssb, cb) uint64_t pre_callback_hrtime_ns = _tf_ssb_callback_pre(ssb)
+#define POST_CALLBACK(ssb, cb) _tf_ssb_callback_post(ssb, cb, pre_callback_hrtime_ns)
+
 static_assert(k_id_base64_len == sodium_base64_ENCODED_LEN(9 + crypto_box_PUBLICKEYBYTES, sodium_base64_VARIANT_ORIGINAL), "k_id_base64_len");
 static_assert(k_id_bin_len == crypto_box_PUBLICKEYBYTES, "k_id_bin_len");
 static_assert(k_blob_id_len == (sodium_base64_ENCODED_LEN(crypto_hash_sha256_BYTES, sodium_base64_VARIANT_ORIGINAL) + 8), "k_blob_id_len");
@@ -229,6 +232,9 @@ typedef struct _tf_ssb_t
 
 	tf_thread_work_time_t* thread_time;
 	int thread_time_count;
+
+	void (*hitch_callback)(const char* name, uint64_t duration, void* user_data);
+	void* hitch_user_data;
 } tf_ssb_t;
 
 typedef struct _tf_ssb_connection_message_request_t
@@ -1008,6 +1014,22 @@ bool tf_ssb_id_str_to_bin(uint8_t* bin, const char* str)
 	return tf_base64_decode(author_id, type - author_id, bin, crypto_box_PUBLICKEYBYTES) != 0;
 }
 
+static uint64_t _tf_ssb_callback_pre(tf_ssb_t* ssb)
+{
+	return uv_hrtime();
+}
+
+static void _tf_ssb_callback_post(tf_ssb_t* ssb, void* callback, uint64_t pre)
+{
+	if (ssb->hitch_callback)
+	{
+		uint64_t post = uv_hrtime();
+		const char* name = tf_util_function_to_string(callback);
+		ssb->hitch_callback(name, post - pre, ssb->hitch_user_data);
+		tf_free((void*)name);
+	}
+}
+
 static void _tf_ssb_notify_connections_changed(tf_ssb_t* ssb, tf_ssb_change_t change, tf_ssb_connection_t* connection)
 {
 	tf_ssb_connections_changed_callback_node_t* next = NULL;
@@ -1015,7 +1037,9 @@ static void _tf_ssb_notify_connections_changed(tf_ssb_t* ssb, tf_ssb_change_t ch
 	{
 		next = node->next;
 		tf_trace_begin(ssb->trace, "connections_changed");
+		PRE_CALLBACK(ssb, node->callback);
 		node->callback(ssb, change, connection, node->user_data);
+		POST_CALLBACK(ssb, node->callback);
 		tf_trace_end(ssb->trace);
 	}
 }
@@ -1451,7 +1475,9 @@ static void _tf_ssb_connection_rpc_recv(tf_ssb_connection_t* connection, uint8_t
 					if (_tf_ssb_name_equals(context, val, it->name))
 					{
 						tf_trace_begin(connection->ssb->trace, it->flattened_name);
+						PRE_CALLBACK(connection->ssb, it->callback);
 						it->callback(connection, flags, request_number, val, message, size, it->user_data);
+						POST_CALLBACK(connection->ssb, it->callback);
 						tf_trace_end(connection->ssb->trace);
 						found = true;
 						break;
@@ -1469,7 +1495,9 @@ static void _tf_ssb_connection_rpc_recv(tf_ssb_connection_t* connection, uint8_t
 						char buffer[64];
 						snprintf(buffer, sizeof(buffer), "request %d", request_number);
 						tf_trace_begin(connection->ssb->trace, buffer);
+						PRE_CALLBACK(connection->ssb, callback);
 						callback(connection, flags, request_number, val, message, size, user_data);
+						POST_CALLBACK(connection->ssb, callback);
 						tf_trace_end(connection->ssb->trace);
 					}
 				}
@@ -1501,7 +1529,9 @@ static void _tf_ssb_connection_rpc_recv(tf_ssb_connection_t* connection, uint8_t
 				char buffer[64];
 				snprintf(buffer, sizeof(buffer), "request %d", request_number);
 				tf_trace_begin(connection->ssb->trace, buffer);
+				PRE_CALLBACK(connection->ssb, callback);
 				callback(connection, flags, request_number, JS_UNDEFINED, message, size, user_data);
+				POST_CALLBACK(connection->ssb, callback);
 				tf_trace_end(connection->ssb->trace);
 			}
 		}
@@ -3462,3 +3492,9 @@ uint64_t tf_ssb_get_average_thread_time(tf_ssb_t* ssb)
 	}
 	return ssb->thread_time_count ? total / ssb->thread_time_count : 0;
 }
+
+void tf_ssb_set_hitch_callback(tf_ssb_t* ssb, void (*callback)(const char* name, uint64_t duration_ns, void* user_data), void* user_data)
+{
+	ssb->hitch_callback = callback;
+	ssb->hitch_user_data = user_data;
+}
diff --git a/src/ssb.h b/src/ssb.h
index 989576e2..305b33bf 100644
--- a/src/ssb.h
+++ b/src/ssb.h
@@ -189,3 +189,5 @@ JSValue tf_ssb_get_disconnection_debug(tf_ssb_t* ssb, JSContext* context);
 
 void tf_ssb_record_thread_time(tf_ssb_t* ssb, int64_t thread_id, uint64_t hrtime);
 uint64_t tf_ssb_get_average_thread_time(tf_ssb_t* ssb);
+
+void tf_ssb_set_hitch_callback(tf_ssb_t* ssb, void (*callback)(const char* name, uint64_t duration_ns, void* user_data), void* user_data);
diff --git a/src/task.c b/src/task.c
index 8e97ab83..2779c746 100644
--- a/src/task.c
+++ b/src/task.c
@@ -34,6 +34,10 @@
 #include <unistd.h>
 #endif
 
+#if !defined(_countof)
+#define _countof(a) ((int)(sizeof((a)) / sizeof(*(a))))
+#endif
+
 static const char* k_version = "1.0";
 
 static JSClassID _import_class_id;
@@ -71,6 +75,12 @@ typedef struct _promise_stack_t
 	int count;
 } promise_stack_t;
 
+typedef struct _hitch_t
+{
+	char name[256];
+	uint64_t duration_ns;
+} hitch_t;
+
 typedef struct _tf_task_t
 {
 	taskid_t _nextTask;
@@ -130,6 +140,8 @@ typedef struct _tf_task_t
 
 	promise_stack_t* _promise_stacks;
 	int _promise_stack_count;
+
+	hitch_t hitches[32];
 } tf_task_t;
 
 typedef struct _export_record_t
@@ -870,6 +882,22 @@ static JSValue _tf_task_getDebug(JSContext* context, JSValueConst this_val, int
 	return result;
 }
 
+static JSValue _tf_task_getHitches(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
+{
+	tf_task_t* task = JS_GetContextOpaque(context);
+	tf_trace_begin(task->_trace, __func__);
+	JSValue result = JS_NewObject(context);
+	for (int i = 0; i < _countof(task->hitches); i++)
+	{
+		if (*task->hitches[i].name)
+		{
+			JS_SetPropertyStr(context, result, task->hitches[i].name, JS_NewFloat64(context, task->hitches[i].duration_ns / 1e9f));
+		}
+	}
+	tf_trace_end(task->_trace);
+	return result;
+}
+
 static JSValue _tf_task_getAllocations(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
 {
 	tf_task_t* task = JS_GetContextOpaque(context);
@@ -1576,6 +1604,24 @@ static void _tf_task_trace_to_parent(tf_trace_t* trace, const char* buffer, size
 	tf_packetstream_send(tf_taskstub_get_stream(task->_parent), kTaskTrace, buffer, size);
 }
 
+static void _tf_task_record_hitch(const char* name, uint64_t duration_ns, void* user_data)
+{
+	tf_task_t* task = user_data;
+	for (int i = 0; i < _countof(task->hitches); i++)
+	{
+		if (duration_ns > task->hitches[i].duration_ns)
+		{
+			if (i + 1 < _countof(task->hitches))
+			{
+				memmove(task->hitches + i + 1, task->hitches + i, sizeof(hitch_t) * (_countof(task->hitches) - i - 1));
+			}
+			snprintf(task->hitches[i].name, sizeof(task->hitches[i].name), "%s", name);
+			task->hitches[i].duration_ns = duration_ns;
+			break;
+		}
+	}
+}
+
 void tf_task_activate(tf_task_t* task)
 {
 	assert(!task->_activated);
@@ -1643,6 +1689,7 @@ void tf_task_activate(tf_task_t* task)
 		task->_ssb = tf_ssb_create(&task->_loop, task->_context, task->_db_path);
 		tf_ssb_set_trace(task->_ssb, task->_trace);
 		tf_ssb_register(context, task->_ssb);
+		tf_ssb_set_hitch_callback(task->_ssb, _tf_task_record_hitch, task);
 
 		if (task->_ssb_port)
 		{
@@ -1654,6 +1701,7 @@ void tf_task_activate(tf_task_t* task)
 		JS_SetPropertyStr(context, global, "trace", JS_NewCFunction(context, _tf_task_trace, "trace", 1));
 		JS_SetPropertyStr(context, global, "getStats", JS_NewCFunction(context, _tf_task_getStats, "getStats", 0));
 		JS_SetPropertyStr(context, global, "getDebug", JS_NewCFunction(context, _tf_task_getDebug, "getDebug", 0));
+		JS_SetPropertyStr(context, global, "getHitches", JS_NewCFunction(context, _tf_task_getHitches, "getHitches", 0));
 		JS_SetPropertyStr(context, global, "getAllocations", JS_NewCFunction(context, _tf_task_getAllocations, "getAllocations", 0));
 		JS_SetPropertyStr(context, global, "disconnectionsDebug", JS_NewCFunction(context, _tf_task_disconnectionsDebug, "disconnectionsDebug", 0));
 	}
diff --git a/src/util.js.c b/src/util.js.c
index 88a7b8eb..d69515f3 100644
--- a/src/util.js.c
+++ b/src/util.js.c
@@ -462,6 +462,30 @@ const char* tf_util_backtrace_to_string(void* const* buffer, int count)
 	return string;
 }
 
+static int _tf_util_backtrace_single_callback(void* data, uintptr_t pc, const char* filename, int line_number, const char* function)
+{
+	char** stack = data;
+	char line[256];
+	int length = snprintf(line, sizeof(line), "%s", function);
+	int current = *stack ? strlen(*stack) : 0;
+	*stack = tf_resize_vec(*stack, current + length + 1);
+	memcpy(*stack + current, line, length + 1);
+	return 0;
+}
+
+const char* tf_util_function_to_string(void* function)
+{
+	extern struct backtrace_state* g_backtrace_state;
+	char* string = NULL;
+	backtrace_pcinfo(
+		g_backtrace_state,
+		(uintptr_t)function,
+		_tf_util_backtrace_single_callback,
+		_tf_util_backtrace_error,
+		&string);
+	return string;
+}
+
 const char* tf_util_backtrace_string()
 {
 	void* buffer[32];
diff --git a/src/util.js.h b/src/util.js.h
index 515be399..d43169d1 100644
--- a/src/util.js.h
+++ b/src/util.js.h
@@ -19,3 +19,5 @@ size_t tf_base64_decode(const char* source, size_t source_length, uint8_t* out,
 int tf_util_backtrace(void** buffer, int count);
 const char* tf_util_backtrace_to_string(void* const* buffer, int count);
 const char* tf_util_backtrace_string();
+
+const char* tf_util_function_to_string(void* function);