diff --git a/parcels/particlefile.py b/parcels/particlefile.py
index f8e5aea65..e27a56243 100644
--- a/parcels/particlefile.py
+++ b/parcels/particlefile.py
@@ -253,14 +253,6 @@ def write(self, pset, time: float | timedelta | np.timedelta64 | None, indices=N
         if self.create_new_zarrfile:
             if self.chunks is None:
                 self._chunks = (len(pset), 1)
-            if pset._repeatpclass is not None and self.chunks[0] < 1e4:  # type: ignore[index]
-                warnings.warn(
-                    f"ParticleFile chunks are set to {self.chunks}, but this may lead to "
-                    f"a significant slowdown in Parcels when many calls to repeatdt. "
-                    f"Consider setting a larger chunk size for your ParticleFile (e.g. chunks=(int(1e4), 1)).",
-                    FileWarning,
-                    stacklevel=2,
-                )
             if (self._maxids > len(ids)) or (self._maxids > self.chunks[0]):  # type: ignore[index]
                 arrsize = (self._maxids, self.chunks[1])  # type: ignore[index]
             else:
diff --git a/parcels/particleset.py b/parcels/particleset.py
index e13ba81ee..c9b16cfde 100644
--- a/parcels/particleset.py
+++ b/parcels/particleset.py
@@ -70,26 +70,16 @@ def __init__(
         lat=None,
         depth=None,
         time=None,
-        repeatdt=None,
         lonlatdepth_dtype=None,
         trajectory_ids=None,
         **kwargs,
     ):
         self._data = None
         self._repeat_starttime = None
-        self._repeatlon = None
-        self._repeatlat = None
-        self._repeatdepth = None
-        self._repeatpclass = None
-        self._repeatkwargs = None
         self._kernel = None
         self._interaction_kernel = None
 
         self.fieldset = fieldset
-
-        if repeatdt:
-            NotImplementedError("ParticleSet.repeatdt is not implemented yet in v4")
-
         lon = np.empty(shape=0) if lon is None else convert_to_flat_array(lon)
         lat = np.empty(shape=0) if lat is None else convert_to_flat_array(lat)
         time = np.empty(shape=0) if time is None else convert_to_flat_array(time)
diff --git a/v3to4-breaking-changes.md b/v3to4-breaking-changes.md
index c6e6979f4..83c68d7f5 100644
--- a/v3to4-breaking-changes.md
+++ b/v3to4-breaking-changes.md
@@ -11,5 +11,6 @@ FieldSet
 
 ParticleSet
 
+- ParticleSet init had repeatdt removed
 - ParticleSet.execute() expects `numpy.datetime64`/`numpy.timedelta.64` for `runtime`, `endtime` and `dt`
 - `ParticleSet.from_field()`, `ParticleSet.from_line()`, `ParticleSet.from_list()` has been removed