diff --git a/gpu/gl/backend.go b/gpu/gl/backend.go
index 28dd2a80..04d915ab 100644
--- a/gpu/gl/backend.go
+++ b/gpu/gl/backend.go
@@ -676,6 +676,12 @@ func (b *gpuBuffer) Upload(data []byte) {
 	if b.hasBuffer {
 		firstBinding := firstBufferType(b.typ)
 		b.backend.funcs.BindBuffer(firstBinding, b.obj)
+		if len(data) == b.size {
+			// the iOS GL implementation doesn't recognize when BufferSubData
+			// clears the entire buffer. Tell it and avoid GPU stalls.
+			// See also https://github.com/godotengine/godot/issues/23956.
+			b.backend.funcs.BufferData(firstBinding, b.size, glimpl.DYNAMIC_DRAW)
+		}
 		b.backend.funcs.BufferSubData(firstBinding, 0, data)
 	}
 }