diff --git a/test-harness/tests/poll_api.rs b/test-harness/tests/poll_api.rs
index 164952f6..1f7b1c76 100644
--- a/test-harness/tests/poll_api.rs
+++ b/test-harness/tests/poll_api.rs
@@ -62,8 +62,6 @@ fn concurrent_streams() {
         let mut cfg = Config::default();
         cfg.set_split_send_size(PAYLOAD_SIZE); // Use a large frame size to speed up the test.
 
-        println!("here");
-
         // TODO: Rethink these.
         cfg.set_connection_window(n_streams * DEFAULT_CREDIT);
         cfg.set_max_num_streams(n_streams);
diff --git a/yamux/src/connection.rs b/yamux/src/connection.rs
index ac9c660f..6acbd1f1 100644
--- a/yamux/src/connection.rs
+++ b/yamux/src/connection.rs
@@ -338,7 +338,10 @@ impl Rtt {
                 }
 
                 inner.rtt = Some(sent_at.elapsed());
-                println!("{}", inner.rtt.as_ref().unwrap().as_secs_f64());
+                log::debug!(
+                    "estimated round-trip-time: {}s",
+                    inner.rtt.as_ref().unwrap().as_secs_f64()
+                );
                 // TODO
                 inner.state = RttState::Waiting {
                     next: Instant::now() + Duration::from_secs(10),
diff --git a/yamux/src/connection/stream.rs b/yamux/src/connection/stream.rs
index 2ee44685..1030dc6b 100644
--- a/yamux/src/connection/stream.rs
+++ b/yamux/src/connection/stream.rs
@@ -562,6 +562,14 @@ impl Shared {
                 let buffer_len = self.buffer.len();
                 let mut new_credit = bytes_received.saturating_sub(buffer_len);
 
+                log::debug!(
+                    "received {} mb in {} seconds ({} mbit/s)",
+                    new_credit as f64 / 1024.0 / 1024.0,
+                    self.last_window_update.elapsed().as_secs_f64(),
+                    new_credit as f64 / 1024.0 / 1024.0 * 8.0
+                        / self.last_window_update.elapsed().as_secs_f64()
+                );
+
                 if new_credit < self.window_max / 2 {
                     return None;
                 }
@@ -586,9 +594,9 @@ impl Shared {
 
                         *accumulated_max_stream_windows += self.window_max - previous_window_max;
                         log::debug!(
-                            "old/new window_max: {}/{}",
-                            previous_window_max,
-                            self.window_max
+                            "old window_max: {} mb, new window_max: {} mb",
+                            previous_window_max as f64 / 1024.0 / 1024.0,
+                            self.window_max as f64 / 1024.0 / 1024.0
                         );
 
                         let bytes_received = self.window_max.saturating_sub(self.window);