diff --git a/metadata-ingestion/src/datahub/ingestion/sink/datahub_rest.py b/metadata-ingestion/src/datahub/ingestion/sink/datahub_rest.py
index 007b7487cb6a4..8572b2378a3bb 100644
--- a/metadata-ingestion/src/datahub/ingestion/sink/datahub_rest.py
+++ b/metadata-ingestion/src/datahub/ingestion/sink/datahub_rest.py
@@ -1,9 +1,9 @@
 import concurrent.futures
 import contextlib
+import dataclasses
 import functools
 import logging
 import uuid
-from dataclasses import dataclass
 from enum import auto
 from typing import Optional, Union
 
@@ -29,6 +29,7 @@
     MetadataChangeProposal,
 )
 from datahub.utilities.advanced_thread_executor import PartitionExecutor
+from datahub.utilities.perf_timer import PerfTimer
 from datahub.utilities.server_config_util import set_gms_config
 
 logger = logging.getLogger(__name__)
@@ -44,15 +45,17 @@ class DatahubRestSinkConfig(DatahubClientConfig):
 
     # These only apply in async mode.
     max_threads: int = 15
-    max_pending_requests: int = 500
+    max_pending_requests: int = 2000
 
 
-@dataclass
+@dataclasses.dataclass
 class DataHubRestSinkReport(SinkReport):
-    max_threads: int = -1
-    gms_version: str = ""
+    max_threads: Optional[int] = None
+    gms_version: Optional[str] = None
     pending_requests: int = 0
 
+    main_thread_blocking_timer: PerfTimer = dataclasses.field(default_factory=PerfTimer)
+
     def compute_stats(self) -> None:
         super().compute_stats()
 
@@ -105,7 +108,7 @@ def __post_init__(self) -> None:
         self.report.gms_version = (
             gms_config.get("versions", {})
             .get("acryldata/datahub", {})
-            .get("version", "")
+            .get("version", None)
         )
         self.report.max_threads = self.config.max_threads
         logger.debug("Setting env variables to override config")
@@ -189,25 +192,28 @@ def write_record_async(
         ],
         write_callback: WriteCallback,
     ) -> None:
-        record = record_envelope.record
-        if self.config.mode == SyncOrAsync.ASYNC:
-            partition_key = _get_partition_key(record_envelope)
-            self.executor.submit(
-                partition_key,
-                self._emit_wrapper,
-                record,
-                done_callback=functools.partial(
-                    self._write_done_callback, record_envelope, write_callback
-                ),
-            )
-            self.report.pending_requests += 1
-        else:
-            # execute synchronously
-            try:
-                self._emit_wrapper(record)
-                write_callback.on_success(record_envelope, success_metadata={})
-            except Exception as e:
-                write_callback.on_failure(record_envelope, e, failure_metadata={})
+        # Because the default is async mode and most sources are slower than the sink, this
+        # should only have a high value if the sink is actually a bottleneck.
+        with self.report.main_thread_blocking_timer:
+            record = record_envelope.record
+            if self.config.mode == SyncOrAsync.ASYNC:
+                partition_key = _get_partition_key(record_envelope)
+                self.executor.submit(
+                    partition_key,
+                    self._emit_wrapper,
+                    record,
+                    done_callback=functools.partial(
+                        self._write_done_callback, record_envelope, write_callback
+                    ),
+                )
+                self.report.pending_requests += 1
+            else:
+                # execute synchronously
+                try:
+                    self._emit_wrapper(record)
+                    write_callback.on_success(record_envelope, success_metadata={})
+                except Exception as e:
+                    write_callback.on_failure(record_envelope, e, failure_metadata={})
 
     def emit_async(
         self,