perf(ui): unpack a single ui event at a time, instead of a "redraw" batch

This reduces the memory overhead for large redraw batches, as a much smaller
prefix of the api object buffer is used and needs to be hot in cache.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/nvim/msgpack_rpc/unpacker.h b/src/nvim/msgpack_rpc/unpacker.h
index e0dc6f0a68..3a5476cd21 100644
--- a/src/nvim/msgpack_rpc/unpacker.h
+++ b/src/nvim/msgpack_rpc/unpacker.h
@@ -32,8 +32,13 @@ struct Unpacker {
   Error unpack_error;
 
   Arena arena;
-  // one lenght free-list of reusable blocks
+  // one length free-list of reusable blocks
   ArenaMem reuse_blk;
+
+  bool is_ui;
+  int nevents;
+  int ncalls;
+  UIClientHandler ui_handler;
 };
 
 // unrecovareble error. unpack_error should be set!