diff --git a/modules/cmd_args.py b/modules/cmd_args.py
index 11ee3e12b..2f60c4419 100644
--- a/modules/cmd_args.py
+++ b/modules/cmd_args.py
@@ -43,6 +43,7 @@ parser.add_argument("--no-hashing", action='store_true', help="Disable sha256 ha
 parser.add_argument("--no-download-sd-model", action='store_true', help="Disable download of default model even if no model is found", default=False)
 parser.add_argument("--profile", action='store_true', help="Run profiler, default: %(default)s")
 parser.add_argument("--disable-queue", action='store_true', help="Disable Gradio queues and force use of HTTP instead of WebSockets, default: %(default)s")
+parser.add_argument("--token-merging", action='store_true', help="Provides speed and memory improvements by merging redundant tokens. This has a more pronounced effect on higher resolutions.", default=False)
 
 
 def compatibility_args(opts, args):
diff --git a/modules/generation_parameters_copypaste.py b/modules/generation_parameters_copypaste.py
index 38ff66ca5..3e7a33bb7 100644
--- a/modules/generation_parameters_copypaste.py
+++ b/modules/generation_parameters_copypaste.py
@@ -286,6 +286,31 @@ Steps: 20, Sampler: Euler a, CFG scale: 7, Seed: 965400086, Size: 512x512, Model
         res["Hires resize-1"] = 0
         res["Hires resize-2"] = 0
 
+    # Infer additional override settings for token merging
+    token_merging_ratio = res.get("Token merging ratio", None)
+    token_merging_ratio_hr = res.get("Token merging ratio hr", None)
+
+    if token_merging_ratio is not None or token_merging_ratio_hr is not None:
+        res["Token merging"] = 'True'
+
+        if token_merging_ratio is None:
+            res["Token merging hr only"] = 'True'
+        else:
+            res["Token merging hr only"] = 'False'
+
+        if res.get("Token merging random", None) is None:
+            res["Token merging random"] = 'False'
+        if res.get("Token merging merge attention", None) is None:
+            res["Token merging merge attention"] = 'True'
+        if res.get("Token merging merge cross attention", None) is None:
+            res["Token merging merge cross attention"] = 'False'
+        if res.get("Token merging merge mlp", None) is None:
+            res["Token merging merge mlp"] = 'False'
+        if res.get("Token merging stride x", None) is None:
+            res["Token merging stride x"] = '2'
+        if res.get("Token merging stride y", None) is None:
+            res["Token merging stride y"] = '2'
+
     restore_old_hires_fix_params(res)
 
     return res
@@ -308,6 +333,17 @@ infotext_to_setting_name_mapping = [
     ('UniPC skip type', 'uni_pc_skip_type'),
     ('UniPC order', 'uni_pc_order'),
     ('UniPC lower order final', 'uni_pc_lower_order_final'),
+    ('Token merging', 'token_merging'),
+    ('Token merging ratio', 'token_merging_ratio'),
+    ('Token merging hr only', 'token_merging_hr_only'),
+    ('Token merging ratio hr', 'token_merging_ratio_hr'),
+    ('Token merging random', 'token_merging_random'),
+    ('Token merging merge attention', 'token_merging_merge_attention'),
+    ('Token merging merge cross attention', 'token_merging_merge_cross_attention'),
+    ('Token merging merge mlp', 'token_merging_merge_mlp'),
+    ('Token merging maximum downsampling', 'token_merging_maximum_downsampling'),
+    ('Token merging stride x', 'token_merging_stride_x'),
+    ('Token merging stride y', 'token_merging_stride_y')
 ]
 
 
diff --git a/modules/processing.py b/modules/processing.py
index c40681961..b1e4ca8e5 100644
--- a/modules/processing.py
+++ b/modules/processing.py
@@ -28,6 +28,12 @@ import modules.images as images
 import modules.styles
 import modules.sd_models as sd_models
 import modules.sd_vae as sd_vae
+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
@@ -475,6 +481,14 @@ 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 not (opts.token_merging or cmd_opts.token_merging) or opts.token_merging_hr_only else opts.token_merging_ratio,
+        "Token merging ratio hr": None if not (opts.token_merging or cmd_opts.token_merging) else opts.token_merging_ratio_hr,
+        "Token merging random": None if opts.token_merging_random is False else opts.token_merging_random,
+        "Token merging merge attention": None if opts.token_merging_merge_attention is True else opts.token_merging_merge_attention,
+        "Token merging merge cross attention": None if opts.token_merging_merge_cross_attention is False else opts.token_merging_merge_cross_attention,
+        "Token merging merge mlp": None if opts.token_merging_merge_mlp is False else opts.token_merging_merge_mlp,
+        "Token merging stride x": None if opts.token_merging_stride_x == 2 else opts.token_merging_stride_x,
+        "Token merging stride y": None if opts.token_merging_stride_y == 2 else opts.token_merging_stride_y
     }
 
     generation_params.update(p.extra_generation_params)
@@ -507,9 +521,18 @@ def process_images(p: StableDiffusionProcessing) -> Processed:
         print(prof.key_averages().table(sort_by="cuda_time_total", row_limit=15))
         """
 
+        if (opts.token_merging or cmd_opts.token_merging) and not opts.token_merging_hr_only:
+            sd_models.apply_token_merging(sd_model=p.sd_model, hr=False)
+            logger.debug('Token merging applied')
+
         res = process_images_inner(p)
 
     finally:
+        # undo model optimizations made by tomesd
+        if opts.token_merging or cmd_opts.token_merging:
+            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():
@@ -945,6 +968,18 @@ class StableDiffusionProcessingTxt2Img(StableDiffusionProcessing):
         x = None
         devices.torch_gc()
 
+        # apply token merging optimizations from tomesd for high-res pass
+        # check if hr_only so we are not redundantly patching
+        if (cmd_opts.token_merging or opts.token_merging) and (opts.token_merging_hr_only or opts.token_merging_ratio_hr != opts.token_merging_ratio):
+            # case where user wants to use separate merge ratios
+            if not opts.token_merging_hr_only:
+                # clean patch done by first pass. (clobbering the first patch might be fine? this might be excessive)
+                tomesd.remove_patch(self.sd_model)
+                logger.debug('Temporarily removed token merging optimizations in preparation for next pass')
+
+            sd_models.apply_token_merging(sd_model=self.sd_model, hr=True)
+            logger.debug('Applied token merging for high-res pass')
+
         samples = self.sampler.sample_img2img(self, samples, noise, conditioning, unconditional_conditioning, steps=self.hr_second_pass_steps or self.steps, image_conditioning=image_conditioning)
 
         return samples
diff --git a/modules/sd_models.py b/modules/sd_models.py
index f72c7b657..19a15757f 100644
--- a/modules/sd_models.py
+++ b/modules/sd_models.py
@@ -16,6 +16,7 @@ from ldm.util import instantiate_from_config
 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"
@@ -541,3 +542,28 @@ 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,
+        max_downsample=shared.opts.token_merging_maximum_down_sampling,
+        sx=shared.opts.token_merging_stride_x,
+        sy=shared.opts.token_merging_stride_y,
+        use_rand=shared.opts.token_merging_random,
+        merge_attn=shared.opts.token_merging_merge_attention,
+        merge_crossattn=shared.opts.token_merging_merge_cross_attention,
+        merge_mlp=shared.opts.token_merging_merge_mlp
+    )
diff --git a/modules/shared.py b/modules/shared.py
index b3244e573..339d32d6d 100644
--- a/modules/shared.py
+++ b/modules/shared.py
@@ -450,6 +450,54 @@ options_templates.update(options_section((None, "Hidden options"), {
     "sd_checkpoint_hash": OptionInfo("", "SHA256 hash of the current checkpoint"),
 }))
 
+options_templates.update(options_section(('token_merging', 'Token Merging'), {
+    "token_merging": OptionInfo(
+        False, "Enable redundant token merging via tomesd. This can provide significant speed and memory improvements.",
+        gr.Checkbox
+    ),
+    "token_merging_ratio": OptionInfo(
+        0.5, "Merging Ratio",
+        gr.Slider, {"minimum": 0, "maximum": 0.9, "step": 0.1}
+    ),
+    "token_merging_hr_only": OptionInfo(
+        True, "Apply only to high-res fix pass. Disabling can yield a ~20-35% speedup on contemporary resolutions.",
+        gr.Checkbox
+    ),
+    "token_merging_ratio_hr": OptionInfo(
+        0.5, "Merging Ratio (high-res pass) - If 'Apply only to high-res' is enabled, this will always be the ratio used.",
+        gr.Slider, {"minimum": 0, "maximum": 0.9, "step": 0.1}
+    ),
+    # More advanced/niche settings:
+    "token_merging_random": OptionInfo(
+        False, "Use random perturbations - Can improve outputs for certain samplers. For others, it may cause visual artifacting.",
+        gr.Checkbox
+    ),
+    "token_merging_merge_attention": OptionInfo(
+        True, "Merge attention",
+        gr.Checkbox
+    ),
+     "token_merging_merge_cross_attention": OptionInfo(
+        False, "Merge cross attention",
+        gr.Checkbox
+    ),
+    "token_merging_merge_mlp": OptionInfo(
+        False, "Merge mlp",
+        gr.Checkbox
+    ),
+    "token_merging_maximum_down_sampling": OptionInfo(
+        1, "Maximum down sampling",
+        gr.Dropdown, lambda: {"choices": ["1", "2", "4", "8"]}
+    ),
+    "token_merging_stride_x": OptionInfo(
+        2, "Stride - X",
+        gr.Slider, {"minimum": 2, "maximum": 8, "step": 2}
+    ),
+    "token_merging_stride_y": OptionInfo(
+        2, "Stride - Y",
+        gr.Slider, {"minimum": 2, "maximum": 8, "step": 2}
+    )
+}))
+
 options_templates.update()
 
 
diff --git a/requirements.txt b/requirements.txt
index d93197eae..80c495d1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -62,3 +62,4 @@ pytorch_lightning==1.9.4
 tensorflow==2.12.0
 transformers==4.26.1
 timm==0.6.13
+tomesd>=0.1.2