diff -r 45bcfd152f85 -r 7b9114030ca4 src/buffer.c
--- a/src/buffer.c	Sun May 01 11:46:54 2022 +0200
+++ b/src/buffer.c	Sun May 01 11:54:10 2022 +0200
@@ -140,7 +140,16 @@
         size_t nitems,
         CxBuffer *buffer
 ) {
-    // TODO: optimize for special case size == nitems == 1
+    // optimize for easy case
+    if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
+        memcpy(buffer->bytes + buffer->pos, ptr, nitems);
+        buffer->pos += nitems;
+        if (buffer->pos > buffer->size) {
+            buffer->size = buffer->pos;
+        }
+        return nitems;
+    }
+
     size_t len;
     if (cx_szmul(size, nitems, &len)) {
         return 0;