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/channel.c b/src/nvim/msgpack_rpc/channel.c
index de01443313..0bb5d800f1 100644
--- a/src/nvim/msgpack_rpc/channel.c
+++ b/src/nvim/msgpack_rpc/channel.c
@@ -239,7 +239,12 @@ static void parse_msgpack(Channel *channel)
 {
   Unpacker *p = channel->rpc.unpacker;
   while (unpacker_advance(p)) {
-    if (p->type == kMessageTypeResponse) {
+    if (p->is_ui) {
+      if (p->ui_handler.fn != NULL && p->result.type == kObjectTypeArray) {
+        p->ui_handler.fn(p->result.data.array);
+      }
+      arena_mem_free(arena_finish(&p->arena), &p->reuse_blk);
+    } else if (p->type == kMessageTypeResponse) {
       ChannelCallFrame *frame = kv_last(channel->rpc.call_stack);
       if (p->request_id != frame->request_id) {
         char buf[256];