diff --git a/src/extensions/client-node.h b/src/extensions/client-node.h
index 97f482aaa..3bcda7c4c 100644
--- a/src/extensions/client-node.h
+++ b/src/extensions/client-node.h
@@ -44,15 +44,6 @@ struct pw_client_node_buffer {
 	struct spa_buffer *buffer;	/**< buffer describing metadata and buffer memory */
 };
 
-#define PW_TYPE_CLIENT_NODE_IO__Position	SPA_TYPE_IO_BASE "ClientNode:Position"
-
-struct pw_client_node_position {
-#define PW_VERSION_CLIENT_NODE_POSITION		0
-	uint32_t version;
-	uint32_t seq1, seq2;		/**< valid contents when equal */
-	/* position info follows */
-};
-
 #define PW_CLIENT_NODE_PROXY_METHOD_DONE		0
 #define PW_CLIENT_NODE_PROXY_METHOD_UPDATE		1
 #define PW_CLIENT_NODE_PROXY_METHOD_PORT_UPDATE		2
diff --git a/src/modules/module-client-node/client-node.c b/src/modules/module-client-node/client-node.c
index 20a5ba8f8..13c22b8f6 100644
--- a/src/modules/module-client-node/client-node.c
+++ b/src/modules/module-client-node/client-node.c
@@ -166,7 +166,7 @@ struct impl {
 	int fds[2];
 	int other_fds[2];
 
-	struct pw_client_node_position *position;
+	struct spa_io_position *position;
 	uint64_t start;
 };
 
@@ -975,19 +975,18 @@ static int impl_node_process(struct spa_node *node)
 {
 	struct node *this = SPA_CONTAINER_OF(node, struct node, node);
 	struct impl *impl = this->impl;
-	struct pw_driver_quantum *q, *rq;
+	struct spa_io_position *q, *rq;
 	uint64_t cmd = 1;
 
 	spa_log_trace(this->log, "%p: send process %p", this, impl->this.node->driver_node);
 
-	q = impl->this.node->driver_node->rt.quantum;
-	rq = SPA_MEMBER(impl->position, sizeof(struct pw_client_node_position),
-			struct pw_driver_quantum);
+	q = impl->this.node->driver_node->rt.position;
+	rq = impl->position;
 
 	if (impl->start == -1)
-		impl->start = q->position;
+		impl->start = q->clock.position;
 	*rq = *q;
-	rq->position -= impl->start;
+	rq->clock.position -= impl->start;
 
 	if (write(this->writefd, &cmd, 8) != 8)
 		spa_log_warn(this->log, "node %p: error %s", this, strerror(errno));
@@ -1279,7 +1278,7 @@ static void node_initialized(void *data)
 	pw_log_debug("client-node %p: transport fd %d %d", node, impl->fds[0], impl->fds[1]);
 
 	area_size = sizeof(struct spa_io_buffers) * MAX_AREAS;
-	size = area_size + sizeof(struct pw_client_node_position) + sizeof(struct pw_driver_quantum);
+	size = area_size + sizeof(struct spa_io_position);
 
 	if (pw_memblock_alloc(PW_MEMBLOCK_FLAG_WITH_FD |
 			      PW_MEMBLOCK_FLAG_MAP_READWRITE |
@@ -1289,16 +1288,16 @@ static void node_initialized(void *data)
                 return;
 
 	impl->position = SPA_MEMBER(impl->io_areas->ptr,
-			area_size, struct pw_client_node_position);
+			area_size, struct spa_io_position);
 
 	m = ensure_mem(impl, impl->io_areas->fd, SPA_DATA_MemFd, impl->io_areas->flags);
 	pw_log_debug("client-node %p: io areas %p", node, impl->io_areas->ptr);
 
 	pw_client_node_resource_set_io(this->resource,
-				       PW_IO_ClientNodePosition,
+				       SPA_IO_Position,
 				       m->id,
 				       area_size,
-				       sizeof(struct pw_client_node_position));
+				       sizeof(struct spa_io_position));
 
 	if ((global = pw_node_get_global(node)) != NULL)
 		pw_client_node_registered(this, pw_global_get_id(global));
diff --git a/src/modules/module-client-node/client-stream.c b/src/modules/module-client-node/client-stream.c
index 86e1c4ff8..a671bf0b9 100644
--- a/src/modules/module-client-node/client-stream.c
+++ b/src/modules/module-client-node/client-stream.c
@@ -847,7 +847,7 @@ static int impl_node_process(struct spa_node *node)
 {
 	struct node *this = SPA_CONTAINER_OF(node, struct node, node);
 	struct impl *impl = this->impl;
-	struct pw_driver_quantum *q = impl->this.node->driver_node->rt.quantum;
+	struct spa_io_position *q = impl->this.node->driver_node->rt.position;
 	int status, trigger;
 
 	if (!impl->active)
diff --git a/src/pipewire/node.c b/src/pipewire/node.c
index 045ffa15b..148e5229a 100644
--- a/src/pipewire/node.c
+++ b/src/pipewire/node.c
@@ -41,6 +41,7 @@
 #include <spa/graph/graph-scheduler2.h>
 
 #define DEFAULT_QUANTUM		1024
+#define MIN_QUANTUM		64
 
 /** \cond */
 struct impl {
@@ -60,7 +61,7 @@ struct impl {
 	struct pw_node_activation root_activation;
 	struct pw_node_activation node_activation;
 
-	struct pw_driver_quantum quantum;
+	struct spa_io_position position;
 	uint32_t next_position;
 };
 
@@ -521,11 +522,13 @@ static int recalc_quantum(struct pw_node *driver)
 	struct pw_node *n;
 
 	spa_list_for_each(n, &driver->driver_list, driver_link) {
-		if (n->rt.quantum_size > 0 && n->rt.quantum_size < quantum)
-			quantum = n->rt.quantum_size;
+		if (n->quantum_size > 0 && n->quantum_size < quantum)
+			quantum = n->quantum_size;
+	}
+	if (driver->rt.position) {
+		driver->rt.position->size = SPA_MAX(quantum, MIN_QUANTUM);
+		pw_log_info("node %p: driver quantum %d", driver, driver->rt.position->size);
 	}
-	driver->rt.quantum->size = quantum;
-	pw_log_info("node %p: driver quantum %d", driver, driver->rt.quantum->size);
 	return 0;
 }
 
@@ -599,11 +602,11 @@ static void check_properties(struct pw_node *node)
 		uint32_t num, denom;
 		pw_log_info("node %p: latency '%s'", node, str);
                 if (sscanf(str, "%u/%u", &num, &denom) == 2 && denom != 0) {
-			node->rt.quantum_size = flp2((num * 48000 / denom));
-			pw_log_info("node %p: quantum %d", node, node->rt.quantum_size);
+			node->quantum_size = flp2((num * 48000 / denom));
+			pw_log_info("node %p: quantum %d", node, node->quantum_size);
 		}
 	} else
-		node->rt.quantum_size = DEFAULT_QUANTUM;
+		node->quantum_size = DEFAULT_QUANTUM;
 
 	pw_log_debug("node %p: graph %p driver:%d", node, &impl->driver_graph, node->driver);
 
@@ -677,9 +680,8 @@ struct pw_node *pw_node_new(struct pw_core *core,
 	spa_graph_node_init(&this->rt.node, &impl->node_activation.state);
 	spa_graph_node_add(&impl->graph, &this->rt.node);
 
-	impl->quantum.rate = SPA_FRACTION(1, 48000);
-	impl->quantum.size = DEFAULT_QUANTUM;
-	this->rt.quantum = &impl->quantum;
+	impl->position.clock.rate = SPA_FRACTION(1, 48000);
+	impl->position.size = DEFAULT_QUANTUM;
 
 	check_properties(this);
 
@@ -776,37 +778,38 @@ static void node_process(void *data, int status)
 {
 	struct pw_node *node = data, *driver;
 	struct impl *impl = SPA_CONTAINER_OF(node, struct impl, this);
+	bool is_driving = false;
 
 	driver = node->driver_node;
 
 	pw_log_trace("node %p: process driver:%d exported:%d %p", node,
 			node->driver, node->exported, driver->rt.driver);
 
-	if (node->driver && driver == node &&
-			(driver->rt.driver->state->pending == 0 || !node->remote)) {
+	if (node->driver) {
+		if (driver == node)
+			is_driving = true;
+		else if (node->rt.position && driver->rt.position)
+			*node->rt.position = *driver->rt.position;
+	}
+
+	if (is_driving && (driver->rt.driver->state->pending == 0 || !node->remote)) {
 		struct timespec ts;
-		struct pw_driver_quantum *q = node->rt.quantum;
+		struct spa_io_position *q = node->rt.position;
 
 		if (driver->rt.driver->state->pending != 0) {
 			pw_log_warn("node %p: graph not finished", node);
 		}
 
-		if (node->rt.clock) {
-			q->nsec = node->rt.clock->nsec;
-			q->rate = node->rt.clock->rate;
-			q->position = node->rt.clock->position;
-			q->delay = node->rt.clock->delay;
-		}
-		else {
+		if (!node->rt.clock) {
 			clock_gettime(CLOCK_MONOTONIC, &ts);
-			q->nsec = SPA_TIMESPEC_TO_TIME(&ts);
-			q->position = impl->next_position;
-			q->delay = 0;
+			q->clock.nsec = SPA_TIMESPEC_TO_TIME(&ts);
+			q->clock.position = impl->next_position;
+			q->clock.delay = 0;
 		}
 
 		pw_log_trace("node %p: run %"PRIu64" %d/%d %"PRIu64" %"PRIi64" %d", node,
-				q->nsec, q->rate.num, q->rate.denom,
-				q->position, q->delay, q->size);
+				q->clock.nsec, q->clock.rate.num, q->clock.rate.denom,
+				q->clock.position, q->clock.delay, q->size);
 
 		spa_graph_run(driver->rt.driver);
 
@@ -842,10 +845,25 @@ static const struct spa_node_callbacks node_callbacks = {
 void pw_node_set_implementation(struct pw_node *node,
 				struct spa_node *spa_node)
 {
+	struct impl *impl = SPA_CONTAINER_OF(node, struct impl, this);
+
 	node->node = spa_node;
 	spa_node_set_callbacks(node->node, &node_callbacks, node);
 	spa_graph_node_set_callbacks(&node->rt.node, &spa_graph_node_impl_default, spa_node);
 
+	if (spa_node_set_io(node->node,
+			    SPA_IO_Position,
+			    &impl->position, sizeof(struct spa_io_position)) >= 0) {
+		pw_log_debug("node %p: set position %p", node, &impl->position);
+		node->rt.position = &impl->position;
+	}
+	if (spa_node_set_io(node->node,
+			    SPA_IO_Clock,
+			    &impl->position.clock, sizeof(struct spa_io_position)) >= 0) {
+		pw_log_debug("node %p: set clock %p", node, &impl->position.clock);
+		node->rt.clock = &impl->position.clock;
+	}
+
 	if (spa_node->info)
 		pw_node_update_properties(node, spa_node->info);
 }
diff --git a/src/pipewire/port.c b/src/pipewire/port.c
index c7df0f083..94ee32adb 100644
--- a/src/pipewire/port.c
+++ b/src/pipewire/port.c
@@ -579,14 +579,6 @@ int pw_port_add(struct pw_port *port, struct pw_node *node)
 		}
 	}
 
-	if (spa_node_port_set_io(node->node,
-			     port->direction, port_id,
-			     SPA_IO_Clock,
-			     &port->rt.clock, sizeof(port->rt.clock)) >= 0) {
-		node->rt.clock = &port->rt.clock;
-		pw_log_debug("port %p: set node clock %p", port, node->rt.clock);
-	}
-
 	if (node->global)
 		pw_port_register(port, node->global->owner, node->global,
 				pw_properties_copy(port->properties));
diff --git a/src/pipewire/private.h b/src/pipewire/private.h
index 74f52dce0..602d187f3 100644
--- a/src/pipewire/private.h
+++ b/src/pipewire/private.h
@@ -255,14 +255,6 @@ struct pw_module {
 	void *user_data;                /**< module user_data */
 };
 
-struct pw_driver_quantum {
-	uint64_t nsec;			/**< time in nanoseconds */
-	struct spa_fraction rate;	/**< rate */
-	uint64_t position;		/**< current position expressed in rate */
-	uint64_t delay;			/**< delay to hardware */
-	uint32_t size;			/**< size of one period expressed in rate */
-};
-
 struct pw_node_activation {
 #define NOT_TRIGGERED	0
 #define TRIGGERED	1
@@ -341,16 +333,16 @@ struct pw_node {
 
 	struct pw_loop *data_loop;		/**< the data loop for this node */
 
+	uint32_t quantum_size;			/**< desired quantum */
 	struct {
 		struct spa_io_clock *clock;	/**< io area of the clock or NULL */
-		struct pw_driver_quantum *quantum;
+		struct spa_io_position *position;
 		struct spa_graph *driver;
 		struct spa_graph_node root;
 		struct pw_node_activation *activation;
 		struct spa_graph_node node;
 		struct spa_graph_node subnode;
 		struct spa_graph_link sublink;
-		uint32_t quantum_size;
 	} rt;
 
         void *user_data;                /**< extra user data */
diff --git a/src/pipewire/remote.c b/src/pipewire/remote.c
index aca193f86..20783fc12 100644
--- a/src/pipewire/remote.c
+++ b/src/pipewire/remote.c
@@ -103,7 +103,7 @@ struct node_data {
 	struct spa_hook node_proxy_listener;
 	struct spa_hook proxy_listener;
 
-	struct pw_client_node_position *position;
+	struct spa_io_position *position;
 
 	struct spa_graph_node_callbacks callbacks;
         void *callbacks_data;
@@ -868,11 +868,7 @@ client_node_set_io(void *object,
 				clear_mem(data, m);
 		}
 		data->position = ptr;
-		if (ptr)
-			data->node->rt.quantum = SPA_MEMBER(ptr,
-					sizeof(struct pw_client_node_position), void);
-		else
-			data->node->rt.quantum = NULL;
+		data->node->rt.position = ptr;
 	}
 	else {
 		pw_log_warn("unknown io id %u", id);
diff --git a/src/pipewire/stream.c b/src/pipewire/stream.c
index 9cfbac7d3..124c6f7b0 100644
--- a/src/pipewire/stream.c
+++ b/src/pipewire/stream.c
@@ -245,6 +245,11 @@ static void call_process(struct stream *impl)
 	}
 }
 
+static int impl_set_io(struct spa_node *node, uint32_t id, void *data, size_t size)
+{
+	return 0;
+}
+
 static int impl_send_command(struct spa_node *node, const struct spa_command *command)
 {
 	struct stream *impl = SPA_CONTAINER_OF(node, struct stream, impl_node);
@@ -646,14 +651,14 @@ static int process_notify(struct stream *impl, struct spa_pod_sequence *sequence
 	return 0;
 }
 
-static inline void copy_quantum(struct stream *impl, int64_t queued)
+static inline void copy_position(struct stream *impl, int64_t queued)
 {
-	struct pw_driver_quantum *q = impl->node->rt.quantum;
+	struct spa_io_position *p = impl->node->rt.position;
 	__atomic_add_fetch(&impl->seq, 1, __ATOMIC_SEQ_CST);
-	impl->time.now = q->nsec;
-	impl->time.rate = q->rate;
-	impl->time.ticks = q->position;
-	impl->time.delay = q->delay;
+	impl->time.now = p->clock.nsec;
+	impl->time.rate = p->clock.rate;
+	impl->time.ticks = p->clock.position;
+	impl->time.delay = p->clock.delay;
 	impl->time.queued = queued;
 	__atomic_add_fetch(&impl->seq, 1, __ATOMIC_SEQ_CST);
 
@@ -689,7 +694,7 @@ static int impl_node_process_input(struct spa_node *node)
 		call_process(impl);
 
       done:
-	copy_quantum(impl, impl->dequeued.incount);
+	copy_position(impl, impl->dequeued.incount);
 
 	/* pop buffer to recycle */
 	if ((b = pop_queue(impl, &impl->queued))) {
@@ -741,7 +746,7 @@ static int impl_node_process_output(struct spa_node *node)
 		    io->status == SPA_STATUS_NEED_BUFFER)
 			goto again;
 	}
-	copy_quantum(impl, impl->queued.outcount);
+	copy_position(impl, impl->queued.outcount);
 
 	res = io->status;
 	pw_log_trace("stream %p: res %d", stream, res);
@@ -751,6 +756,7 @@ static int impl_node_process_output(struct spa_node *node)
 
 static const struct spa_node impl_node = {
 	SPA_VERSION_NODE,
+	.set_io = impl_set_io,
 	.send_command = impl_send_command,
 	.set_callbacks = impl_set_callbacks,
 	.get_n_ports = impl_get_n_ports,