diff --git a/vsaa/antialiasers/eedi3.py b/vsaa/antialiasers/eedi3.py
index d4139d7..ecdba45 100644
--- a/vsaa/antialiasers/eedi3.py
+++ b/vsaa/antialiasers/eedi3.py
@@ -29,6 +29,7 @@ class EEDI3(_Antialiaser):
     vthresh1: float = 64.0
     vthresh2: float = 4.0
 
+    opt: int = 0
     device: int = -1
     opencl: bool = dc_field(default=False, kw_only=True)
 
@@ -59,6 +60,10 @@ def get_aa_args(self, clip: vs.VideoNode, **kwargs: Any) -> dict[str, Any]:
         if self.opencl:
             args |= dict(device=self.device)
 
+        # opt=3 appears to always give reliable speed boosts if mclip is used.
+        if self.mclip is not None or kwargs.get('mclip'):
+            args |= dict(opt=self.opt or kwargs.get('opt') or 3)
+
         return args
 
     def interpolate(self, clip: vs.VideoNode, double_y: bool, **kwargs: Any) -> vs.VideoNode: