diff --git a/benchmarks/app/asgi.py b/benchmarks/app/asgi.py
index 5297c41e..3ae7ea0b 100644
--- a/benchmarks/app/asgi.py
+++ b/benchmarks/app/asgi.py
@@ -1,3 +1,4 @@
+import asyncio
 import pathlib
 import sys
 
@@ -84,6 +85,19 @@ async def file_pathsend(scope, receive, send):
     await send({'type': 'http.response.pathsend', 'path': str(MEDIA_PATH)})
 
 
+def io_builder(wait):
+    wait = wait / 1000
+    async def io(scope, receive, send):
+        await send(PLAINTEXT_RESPONSE)
+        await asyncio.sleep(wait)
+        await send({
+            'type': 'http.response.body',
+            'body': BODY_BYTES_SHORT,
+            'more_body': False
+        })
+    return io
+
+
 async def handle_404(scope, receive, send):
     content = b'Not found'
     await send(PLAINTEXT_RESPONSE)
@@ -102,6 +116,8 @@ async def handle_404(scope, receive, send):
     '/echo': echo,
     '/fb': file_body,
     '/fp': file_pathsend,
+    '/io10': io_builder(10),
+    '/io100': io_builder(100),
 }
 
 
diff --git a/benchmarks/app/rsgi.py b/benchmarks/app/rsgi.py
index 658620d8..82bfe010 100644
--- a/benchmarks/app/rsgi.py
+++ b/benchmarks/app/rsgi.py
@@ -1,3 +1,4 @@
+import asyncio
 import pathlib
 import sys
 
@@ -60,6 +61,18 @@ async def file(scope, proto):
     )
 
 
+def io_builder(wait):
+    wait = wait / 1000
+    async def io(scope, proto):
+        await asyncio.sleep(wait)
+        proto.response_bytes(
+            200,
+            HEADERS,
+            BODY_BYTES_SHORT
+        )
+    return io
+
+
 async def handle_404(scope, proto):
     proto.response_str(
         404,
@@ -75,6 +88,8 @@ async def handle_404(scope, proto):
     '/ss': s_long,
     '/echo': echo,
     '/fp': file,
+    '/io10': io_builder(10),
+    '/io100': io_builder(100),
 }
 
 
diff --git a/benchmarks/app/wsgi.py b/benchmarks/app/wsgi.py
index eb83f6a3..98c1330b 100644
--- a/benchmarks/app/wsgi.py
+++ b/benchmarks/app/wsgi.py
@@ -1,3 +1,5 @@
+import time
+
 HEADERS = [('content-type', 'text/plain; charset=utf-8')]
 
 BODY_BYTES_SHORT = b"Test"
@@ -31,6 +33,15 @@ def echo(environ, proto):
     return [environ['wsgi.input'].read()]
 
 
+def io_builder(wait):
+    wait = wait / 1000
+    def io(environ, proto):
+        proto('200 OK', HEADERS)
+        time.sleep(wait)
+        return [BODY_BYTES_SHORT]
+    return io
+
+
 def handle_404(environ, proto):
     proto('404 NOT FOUND', HEADERS)
     return [b"not found"]
@@ -41,7 +52,9 @@ def handle_404(environ, proto):
     '/bb': b_long,
     '/s': s_short,
     '/ss': s_long,
-    '/echo': echo
+    '/echo': echo,
+    '/io10': io_builder(10),
+    '/io100': io_builder(100),
 }
 
 
diff --git a/benchmarks/benchmarks.py b/benchmarks/benchmarks.py
index 4b212dab..6c216ad0 100644
--- a/benchmarks/benchmarks.py
+++ b/benchmarks/benchmarks.py
@@ -263,6 +263,27 @@ def vs_files():
     return results
 
 
+def vs_io():
+    results = {}
+    benches = {"10ms": ("io10", {}), "100ms": ("io100", {})}
+    for fw in [
+        "granian_rsgi",
+        "granian_asgi",
+        "granian_wsgi",
+        "uvicorn_httptools",
+        "hypercorn",
+        "gunicorn_gevent",
+        "uwsgi",
+    ]:
+        for key, bench_data in benches.items():
+            route, opts = bench_data
+            fw_app = fw.split("_")[1] if fw.startswith("granian") else fw
+            title = " ".join(item.title() for item in fw.split("_"))
+            with app(fw_app):
+                results[f"{title} {key}"] = benchmark(route, **opts)
+    return results
+
+
 def _granian_version():
     import granian
     return granian.__version__
@@ -283,6 +304,7 @@ def run():
         results["vs_wsgi"] = vs_wsgi()
         results["vs_http2"] = vs_http2()
         results["vs_files"] = vs_files()
+        results["vs_io"] = vs_io()
     with open("results/data.json", "w") as f:
         pyver = sys.version_info
         f.write(json.dumps({
diff --git a/benchmarks/templates/vs.md b/benchmarks/templates/vs.md
index b4356530..11e9f2e7 100644
--- a/benchmarks/templates/vs.md
+++ b/benchmarks/templates/vs.md
@@ -28,3 +28,10 @@ Granian version: {{ =data.granian }}
 
 {{ _data = data.results["vs_files"] }}
 {{ include './_vs_table.tpl' }}
+
+### Long I/O
+
+Plain text 4 bytes response comparison simulating *long* I/O waits (10ms and 100ms).
+
+{{ _data = data.results["vs_io"] }}
+{{ include './_vs_table.tpl' }}