--- a/src/main/ssh/ssh-multiplexer-writer-lane-scheduler.ts
+++ b/src/main/ssh/ssh-multiplexer-writer-lane-scheduler.ts
@@ -6 +6 @@
-  entries: T[]
+  entries: (T | undefined)[]
@@ -22,0 +23 @@
+  queue.entries[queue.head] = undefined
@@ -24,2 +25,5 @@
-  if (queue.head === queue.entries.length) {
-    queue.entries.length = 0
+  if (
+    queue.head === queue.entries.length ||
+    (queue.head >= 1024 && queue.head * 2 >= queue.entries.length)
+  ) {
+    queue.entries = queue.entries.slice(queue.head)
@@ -32 +36 @@
-  const entries = queue.entries.slice(queue.head)
+  const entries = queue.entries.slice(queue.head).filter((entry): entry is T => entry !== undefined)