diff --git a/frappe/rate_limiter.py b/frappe/rate_limiter.py
index 8cdc4adb1f..a09cfe96ed 100644
--- a/frappe/rate_limiter.py
+++ b/frappe/rate_limiter.py
@@ -1,7 +1,7 @@
 # Copyright (c) 2020, Frappe Technologies Pvt. Ltd. and Contributors
 # License: MIT. See LICENSE
 
-import datetime
+import time
 from collections.abc import Callable
 from functools import wraps
 
@@ -30,14 +30,28 @@ def respond():
 
 
 class RateLimiter:
+	__slots__ = (
+		"counter",
+		"duration",
+		"end",
+		"key",
+		"limit",
+		"rejected",
+		"remaining",
+		"reset",
+		"spent",
+		"start",
+		"window",
+		"window_number",
+	)
+
 	def __init__(self, limit, window):
 		self.limit = int(limit * 1000000)
 		self.window = window
 
-		self.start = datetime.datetime.now(datetime.timezone.utc)
-		timestamp = int(frappe.utils.now_datetime().timestamp())
+		self.start = time.time()
 
-		self.window_number, self.spent = divmod(timestamp, self.window)
+		self.window_number, self.spent = divmod(int(self.start), self.window)
 		self.key = frappe.cache.make_key(f"rate-limit-counter-{self.window_number}")
 		self.counter = cint(frappe.cache.get(self.key))
 		self.remaining = max(self.limit - self.counter, 0)
@@ -57,7 +71,7 @@ class RateLimiter:
 
 	def update(self):
 		self.record_request_end()
-		pipeline = frappe.cache.pipeline()
+		pipeline = frappe.cache.pipeline(transaction=False)
 		pipeline.incrby(self.key, self.duration)
 		pipeline.expire(self.key, self.window)
 		pipeline.execute()
@@ -71,16 +85,14 @@ class RateLimiter:
 		}
 		if self.rejected:
 			headers["Retry-After"] = self.reset
-		else:
-			headers["X-RateLimit-Used"] = self.duration
 
 		return headers
 
 	def record_request_end(self):
 		if self.end is not None:
 			return
-		self.end = datetime.datetime.now(datetime.timezone.utc)
-		self.duration = int((self.end - self.start).total_seconds() * 1000000)
+		self.end = time.time()
+		self.duration = int((self.end - self.start) * 1000000)
 
 	def respond(self):
 		if self.rejected:
diff --git a/frappe/tests/test_rate_limiter.py b/frappe/tests/test_rate_limiter.py
index 97d82714ea..aa1393ab08 100644
--- a/frappe/tests/test_rate_limiter.py
+++ b/frappe/tests/test_rate_limiter.py
@@ -45,7 +45,6 @@ class TestRateLimiter(IntegrationTestCase):
 
 		headers = frappe.local.rate_limiter.headers()
 		self.assertIn("Retry-After", headers)
-		self.assertNotIn("X-RateLimit-Used", headers)
 		self.assertIn("X-RateLimit-Reset", headers)
 		self.assertIn("X-RateLimit-Limit", headers)
 		self.assertIn("X-RateLimit-Remaining", headers)
@@ -75,7 +74,6 @@ class TestRateLimiter(IntegrationTestCase):
 		self.assertNotIn("Retry-After", headers)
 		self.assertIn("X-RateLimit-Reset", headers)
 		self.assertTrue(int(headers["X-RateLimit-Reset"] < 86400))
-		self.assertEqual(int(headers["X-RateLimit-Used"]), frappe.local.rate_limiter.duration)
 		self.assertEqual(int(headers["X-RateLimit-Limit"]), 10000)
 		self.assertEqual(int(headers["X-RateLimit-Remaining"]), 10000)