diff --git a/modules/generation_parameters_copypaste.py b/modules/generation_parameters_copypaste.py
index b0e945a12dc..a0a98bbcb03 100644
--- a/modules/generation_parameters_copypaste.py
+++ b/modules/generation_parameters_copypaste.py
@@ -308,8 +308,10 @@ def parse_generation_parameters(x: str):
     ('UniPC skip type', 'uni_pc_skip_type'),
     ('UniPC order', 'uni_pc_order'),
     ('UniPC lower order final', 'uni_pc_lower_order_final'),
+    ('Token merging ratio', 'token_merging_ratio'),
+    ('Token merging ratio hr', 'token_merging_ratio_hr'),
     ('RNG', 'randn_source'),
-    ('NGMS', 's_min_uncond'),
+    ('NGMS', 's_min_uncond')
 ]
 
 
diff --git a/modules/processing.py b/modules/processing.py
index f902b9df969..94fe2625cd7 100644
--- a/modules/processing.py
+++ b/modules/processing.py
@@ -29,6 +29,13 @@
 
 from einops import repeat, rearrange
 from blendmodes.blend import blendLayers, BlendType
+import tomesd
+
+# add a logger for the processing module
+logger = logging.getLogger(__name__)
+# manually set output level here since there is no option to do so yet through launch options
+# logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(levelname)s %(name)s %(message)s')
+
 
 # some of those options should not be changed at all because they would break the model, so I removed them from options.
 opt_C = 4
@@ -471,6 +478,7 @@ def create_infotext(p, all_prompts, all_seeds, all_subseeds, comments=None, iter
     index = position_in_batch + iteration * p.batch_size
 
     clip_skip = getattr(p, 'clip_skip', opts.CLIP_stop_at_last_layers)
+    enable_hr = getattr(p, 'enable_hr', False)
 
     generation_params = {
         "Steps": p.steps,
@@ -489,6 +497,8 @@ def create_infotext(p, all_prompts, all_seeds, all_subseeds, comments=None, iter
         "Conditional mask weight": getattr(p, "inpainting_mask_weight", shared.opts.inpainting_mask_weight) if p.is_using_inpainting_conditioning else None,
         "Clip skip": None if clip_skip <= 1 else clip_skip,
         "ENSD": None if opts.eta_noise_seed_delta == 0 else opts.eta_noise_seed_delta,
+        "Token merging ratio": None if opts.token_merging_ratio == 0 else opts.token_merging_ratio,
+        "Token merging ratio hr": None if not enable_hr or opts.token_merging_ratio_hr == 0 else opts.token_merging_ratio_hr,
         "Init image hash": getattr(p, 'init_img_hash', None),
         "RNG": opts.randn_source if opts.randn_source != "GPU" else None,
         "NGMS": None if p.s_min_uncond == 0 else p.s_min_uncond,
@@ -522,9 +532,18 @@ def process_images(p: StableDiffusionProcessing) -> Processed:
             if k == 'sd_vae':
                 sd_vae.reload_vae_weights()
 
+        if opts.token_merging_ratio > 0:
+            sd_models.apply_token_merging(sd_model=p.sd_model, hr=False)
+            logger.debug(f"Token merging applied to first pass. Ratio: '{opts.token_merging_ratio}'")
+
         res = process_images_inner(p)
 
     finally:
+        # undo model optimizations made by tomesd
+        if opts.token_merging_ratio > 0:
+            tomesd.remove_patch(p.sd_model)
+            logger.debug('Token merging model optimizations removed')
+
         # restore opts to original state
         if p.override_settings_restore_afterwards:
             for k, v in stored_opts.items():
@@ -977,8 +996,22 @@ def save_intermediate(image, index):
         x = None
         devices.torch_gc()
 
+        # apply token merging optimizations from tomesd for high-res pass
+        if opts.token_merging_ratio_hr > 0:
+            # in case the user has used separate merge ratios
+            if opts.token_merging_ratio > 0:
+                tomesd.remove_patch(self.sd_model)
+                logger.debug('Adjusting token merging ratio for high-res pass')
+
+            sd_models.apply_token_merging(sd_model=self.sd_model, hr=True)
+            logger.debug(f"Applied token merging for high-res pass. Ratio: '{opts.token_merging_ratio_hr}'")
+
         samples = self.sampler.sample_img2img(self, samples, noise, conditioning, unconditional_conditioning, steps=self.hr_second_pass_steps or self.steps, image_conditioning=image_conditioning)
 
+        if opts.token_merging_ratio_hr > 0 or opts.token_merging_ratio > 0:
+            tomesd.remove_patch(self.sd_model)
+            logger.debug('Removed token merging optimizations from model')
+
         self.is_hr_pass = False
 
         return samples
diff --git a/modules/sd_models.py b/modules/sd_models.py
index 3316d021184..4c9a0a1fb70 100644
--- a/modules/sd_models.py
+++ b/modules/sd_models.py
@@ -17,6 +17,7 @@
 from modules import paths, shared, modelloader, devices, script_callbacks, sd_vae, sd_disable_initialization, errors, hashes, sd_models_config
 from modules.sd_hijack_inpainting import do_inpainting_hijack
 from modules.timer import Timer
+import tomesd
 
 model_dir = "Stable-diffusion"
 model_path = os.path.abspath(os.path.join(paths.models_path, model_dir))
@@ -578,3 +579,25 @@ def unload_model_weights(sd_model=None, info=None):
     print(f"Unloaded weights {timer.summary()}.")
 
     return sd_model
+
+
+def apply_token_merging(sd_model, hr: bool):
+    """
+    Applies speed and memory optimizations from tomesd.
+
+    Args:
+        hr (bool): True if called in the context of a high-res pass
+    """
+
+    ratio = shared.opts.token_merging_ratio
+    if hr:
+        ratio = shared.opts.token_merging_ratio_hr
+
+    tomesd.apply_patch(
+        sd_model,
+        ratio=ratio,
+        use_rand=False,  # can cause issues with some samplers
+        merge_attn=True,
+        merge_crossattn=False,
+        merge_mlp=False
+    )
diff --git a/modules/shared.py b/modules/shared.py
index 96a20a6bd9d..a5e8d0bd019 100644
--- a/modules/shared.py
+++ b/modules/shared.py
@@ -350,6 +350,8 @@ def list_samplers():
     "CLIP_stop_at_last_layers": OptionInfo(1, "Clip skip", gr.Slider, {"minimum": 1, "maximum": 12, "step": 1}),
     "upcast_attn": OptionInfo(False, "Upcast cross attention layer to float32"),
     "randn_source": OptionInfo("GPU", "Random number generator source. Changes seeds drastically. Use CPU to produce the same picture across different vidocard vendors.", gr.Radio, {"choices": ["GPU", "CPU"]}),
+    "token_merging_ratio_hr": OptionInfo(0, "Merging Ratio (high-res pass)", gr.Slider, {"minimum": 0, "maximum": 0.9, "step": 0.1}),
+    "token_merging_ratio": OptionInfo(0, "Merging Ratio", gr.Slider, {"minimum": 0, "maximum": 0.9, "step": 0.1})
 }))
 
 options_templates.update(options_section(('compatibility', "Compatibility"), {
@@ -458,6 +460,7 @@ def list_samplers():
     "sd_checkpoint_hash": OptionInfo("", "SHA256 hash of the current checkpoint"),
 }))
 
+
 options_templates.update()
 
 
diff --git a/requirements_versions.txt b/requirements_versions.txt
index 0a276b0b4b8..0e03deedc0c 100644
--- a/requirements_versions.txt
+++ b/requirements_versions.txt
@@ -26,3 +26,4 @@ torchsde==0.2.5
 safetensors==0.3.1
 httpcore<=0.15
 fastapi==0.94.0
+tomesd>=0.1.2
\ No newline at end of file