diff --git a/deploy/clickhouse.yaml b/deploy/clickhouse.yaml
index cb19e974..d11dea02 100644
--- a/deploy/clickhouse.yaml
+++ b/deploy/clickhouse.yaml
@@ -182,6 +182,10 @@ data:
                 <max_block_size>8192</max_block_size>
                 <queue_max_wait_ms>1000</queue_max_wait_ms>
                 <max_execution_time>600</max_execution_time>
+                <!-- Buffer small inserts server-side before creating parts -->
+                <async_insert>1</async_insert>
+                <wait_for_async_insert>0</wait_for_async_insert>
+                <async_insert_busy_timeout_ms>5000</async_insert_busy_timeout_ms>
                 <!-- Disable parallel parse/format to reduce per-query memory -->
                 <input_format_parallel_parsing>0</input_format_parallel_parsing>
                 <output_format_parallel_formatting>0</output_format_parallel_formatting>