diff --git a/src/spikeinterface/core/basesorting.py b/src/spikeinterface/core/basesorting.py
index 056134a24e..e6d08d38f7 100644
--- a/src/spikeinterface/core/basesorting.py
+++ b/src/spikeinterface/core/basesorting.py
@@ -473,8 +473,7 @@ def to_spike_vector(self, concatenated=True, extremum_channel_inds=None, use_cac
             if not concatenated:
                 spikes_ = []
                 for segment_index in range(self.get_num_segments()):
-                    s0 = np.searchsorted(spikes["segment_index"], segment_index, side="left")
-                    s1 = np.searchsorted(spikes["segment_index"], segment_index + 1, side="left")
+                    s0, s1 = np.searchsorted(spikes["segment_index"], [segment_index, segment_index + 1], side="left")
                     spikes_.append(spikes[s0:s1])
                 spikes = spikes_
 
diff --git a/src/spikeinterface/core/node_pipeline.py b/src/spikeinterface/core/node_pipeline.py
index 1ba7c59c82..3b2b610cf5 100644
--- a/src/spikeinterface/core/node_pipeline.py
+++ b/src/spikeinterface/core/node_pipeline.py
@@ -111,8 +111,7 @@ def __init__(self, recording, peaks):
         # precompute segment slice
         self.segment_slices = []
         for segment_index in range(recording.get_num_segments()):
-            i0 = np.searchsorted(peaks["segment_index"], segment_index)
-            i1 = np.searchsorted(peaks["segment_index"], segment_index + 1)
+            i0, i1 = np.searchsorted(peaks["segment_index"], [segment_index, segment_index + 1])
             self.segment_slices.append(slice(i0, i1))
 
     def get_trace_margin(self):
@@ -131,8 +130,7 @@ def compute(self, traces, start_frame, end_frame, segment_index, max_margin):
         # get local peaks
         sl = self.segment_slices[segment_index]
         peaks_in_segment = self.peaks[sl]
-        i0 = np.searchsorted(peaks_in_segment["sample_index"], start_frame)
-        i1 = np.searchsorted(peaks_in_segment["sample_index"], end_frame)
+        i0, i1 = np.searchsorted(peaks_in_segment["sample_index"], [start_frame, end_frame])
         local_peaks = peaks_in_segment[i0:i1]
 
         # make sample index local to traces
@@ -189,8 +187,7 @@ def __init__(
         # precompute segment slice
         self.segment_slices = []
         for segment_index in range(recording.get_num_segments()):
-            i0 = np.searchsorted(self.peaks["segment_index"], segment_index)
-            i1 = np.searchsorted(self.peaks["segment_index"], segment_index + 1)
+            i0, i1 = np.searchsorted(self.peaks["segment_index"], [segment_index, segment_index + 1])
             self.segment_slices.append(slice(i0, i1))
 
     def get_trace_margin(self):
@@ -209,8 +206,7 @@ def compute(self, traces, start_frame, end_frame, segment_index, max_margin):
         # get local peaks
         sl = self.segment_slices[segment_index]
         peaks_in_segment = self.peaks[sl]
-        i0 = np.searchsorted(peaks_in_segment["sample_index"], start_frame)
-        i1 = np.searchsorted(peaks_in_segment["sample_index"], end_frame)
+        i0, i1 = np.searchsorted(peaks_in_segment["sample_index"], [start_frame, end_frame])
         local_peaks = peaks_in_segment[i0:i1]
 
         # make sample index local to traces
diff --git a/src/spikeinterface/core/numpyextractors.py b/src/spikeinterface/core/numpyextractors.py
index 97f22615df..d5663156c7 100644
--- a/src/spikeinterface/core/numpyextractors.py
+++ b/src/spikeinterface/core/numpyextractors.py
@@ -338,8 +338,7 @@ def get_unit_spike_train(self, unit_id, start_frame, end_frame):
         if self.spikes_in_seg is None:
             # the slicing of segment is done only once the first time
             # this fasten the constructor a lot
-            s0 = np.searchsorted(self.spikes["segment_index"], self.segment_index, side="left")
-            s1 = np.searchsorted(self.spikes["segment_index"], self.segment_index + 1, side="left")
+            s0, s1 = np.searchsorted(self.spikes["segment_index"], [self.segment_index, self.segment_index + 1])
             self.spikes_in_seg = self.spikes[s0:s1]
 
         unit_index = self.unit_ids.index(unit_id)
diff --git a/src/spikeinterface/core/segmentutils.py b/src/spikeinterface/core/segmentutils.py
index f70c45bfe5..85e36cf7a5 100644
--- a/src/spikeinterface/core/segmentutils.py
+++ b/src/spikeinterface/core/segmentutils.py
@@ -174,8 +174,7 @@ def get_traces(self, start_frame, end_frame, channel_indices):
             # Return (0 * num_channels) array of correct dtype
             return self.parent_segments[0].get_traces(0, 0, channel_indices)
 
-        i0 = np.searchsorted(self.cumsum_length, start_frame, side="right") - 1
-        i1 = np.searchsorted(self.cumsum_length, end_frame, side="right") - 1
+        i0, i1 = np.searchsorted(self.cumsum_length, [start_frame, end_frame], side="right") - 1
 
         # several case:
         #  * come from one segment (i0 == i1)
@@ -469,8 +468,7 @@ def get_unit_spike_train(
         if end_frame is None:
             end_frame = self.get_num_samples()
 
-        i0 = np.searchsorted(self.cumsum_length, start_frame, side="right") - 1
-        i1 = np.searchsorted(self.cumsum_length, end_frame, side="right") - 1
+        i0, i1 = np.searchsorted(self.cumsum_length, [start_frame, end_frame], side="right") - 1
 
         # several case:
         #  * come from one segment (i0 == i1)
diff --git a/src/spikeinterface/core/waveform_tools.py b/src/spikeinterface/core/waveform_tools.py
index da8e3d64b6..a2f1296e31 100644
--- a/src/spikeinterface/core/waveform_tools.py
+++ b/src/spikeinterface/core/waveform_tools.py
@@ -344,15 +344,15 @@ def _worker_distribute_buffers(segment_index, start_frame, end_frame, worker_ctx
 
     # take only spikes with the correct segment_index
     # this is a slice so no copy!!
-    s0 = np.searchsorted(spikes["segment_index"], segment_index)
-    s1 = np.searchsorted(spikes["segment_index"], segment_index + 1)
+    s0, s1 = np.searchsorted(spikes["segment_index"], [segment_index, segment_index + 1])
     in_seg_spikes = spikes[s0:s1]
 
     # take only spikes in range [start_frame, end_frame]
     # this is a slice so no copy!!
     # the border of segment are protected by nbefore on left an nafter on the right
-    i0 = np.searchsorted(in_seg_spikes["sample_index"], max(start_frame, nbefore))
-    i1 = np.searchsorted(in_seg_spikes["sample_index"], min(end_frame, seg_size - nafter))
+    i0, i1 = np.searchsorted(
+        in_seg_spikes["sample_index"], [max(start_frame, nbefore), min(end_frame, seg_size - nafter)]
+    )
 
     # slice in absolut in spikes vector
     l0 = i0 + s0
@@ -562,8 +562,7 @@ def _init_worker_distribute_single_buffer(
     # prepare segment slices
     segment_slices = []
     for segment_index in range(recording.get_num_segments()):
-        s0 = np.searchsorted(spikes["segment_index"], segment_index)
-        s1 = np.searchsorted(spikes["segment_index"], segment_index + 1)
+        s0, s1 = np.searchsorted(spikes["segment_index"], [segment_index, segment_index + 1])
         segment_slices.append((s0, s1))
     worker_ctx["segment_slices"] = segment_slices
 
@@ -590,8 +589,9 @@ def _worker_distribute_single_buffer(segment_index, start_frame, end_frame, work
     # take only spikes in range [start_frame, end_frame]
     # this is a slice so no copy!!
     # the border of segment are protected by nbefore on left an nafter on the right
-    i0 = np.searchsorted(in_seg_spikes["sample_index"], max(start_frame, nbefore))
-    i1 = np.searchsorted(in_seg_spikes["sample_index"], min(end_frame, seg_size - nafter))
+    i0, i1 = np.searchsorted(
+        in_seg_spikes["sample_index"], [max(start_frame, nbefore), min(end_frame, seg_size - nafter)]
+    )
 
     # slice in absolut in spikes vector
     l0 = i0 + s0
@@ -685,8 +685,7 @@ def has_exceeding_spikes(recording, sorting):
     """
     spike_vector = sorting.to_spike_vector()
     for segment_index in range(recording.get_num_segments()):
-        start_seg_ind = np.searchsorted(spike_vector["segment_index"], segment_index)
-        end_seg_ind = np.searchsorted(spike_vector["segment_index"], segment_index + 1)
+        start_seg_ind, end_seg_ind = np.searchsorted(spike_vector["segment_index"], [segment_index, segment_index + 1])
         spike_vector_seg = spike_vector[start_seg_ind:end_seg_ind]
         if len(spike_vector_seg) > 0:
             if spike_vector_seg["sample_index"][-1] > recording.get_num_samples(segment_index=segment_index) - 1:
diff --git a/src/spikeinterface/postprocessing/amplitude_scalings.py b/src/spikeinterface/postprocessing/amplitude_scalings.py
index 5a3542cdf9..22b40a51c5 100644
--- a/src/spikeinterface/postprocessing/amplitude_scalings.py
+++ b/src/spikeinterface/postprocessing/amplitude_scalings.py
@@ -99,8 +99,7 @@ def _run(self, **job_kwargs):
         # precompute segment slice
         segment_slices = []
         for segment_index in range(we.get_num_segments()):
-            i0 = np.searchsorted(self.spikes["segment_index"], segment_index)
-            i1 = np.searchsorted(self.spikes["segment_index"], segment_index + 1)
+            i0, i1 = np.searchsorted(self.spikes["segment_index"], [segment_index, segment_index + 1])
             segment_slices.append(slice(i0, i1))
 
         # and run
@@ -317,8 +316,7 @@ def _amplitude_scalings_chunk(segment_index, start_frame, end_frame, worker_ctx)
 
     spikes_in_segment = spikes[segment_slices[segment_index]]
 
-    i0 = np.searchsorted(spikes_in_segment["sample_index"], start_frame)
-    i1 = np.searchsorted(spikes_in_segment["sample_index"], end_frame)
+    i0, i1 = np.searchsorted(spikes_in_segment["sample_index"], [start_frame, end_frame])
 
     if i0 != i1:
         local_spikes = spikes_in_segment[i0:i1]
@@ -335,8 +333,9 @@ def _amplitude_scalings_chunk(segment_index, start_frame, end_frame, worker_ctx)
         # set colliding spikes apart (if needed)
         if handle_collisions:
             # local spikes with margin!
-            i0_margin = np.searchsorted(spikes_in_segment["sample_index"], start_frame - left)
-            i1_margin = np.searchsorted(spikes_in_segment["sample_index"], end_frame + right)
+            i0_margin, i1_margin = np.searchsorted(
+                spikes_in_segment["sample_index"], [start_frame - left, end_frame + right]
+            )
             local_spikes_w_margin = spikes_in_segment[i0_margin:i1_margin]
             collisions_local = find_collisions(
                 local_spikes, local_spikes_w_margin, delta_collision_samples, unit_inds_to_channel_indices
@@ -462,14 +461,11 @@ def find_collisions(spikes, spikes_w_margin, delta_collision_samples, unit_inds_
         spike_index_w_margin = np.where(spikes_w_margin == spike)[0][0]
 
         # find the possible spikes per and post within delta_collision_samples
-        consecutive_window_pre = np.searchsorted(
-            spikes_w_margin["sample_index"],
-            spike["sample_index"] - delta_collision_samples,
-        )
-        consecutive_window_post = np.searchsorted(
+        consecutive_window_pre, consecutive_window_post = np.searchsorted(
             spikes_w_margin["sample_index"],
-            spike["sample_index"] + delta_collision_samples,
+            [spike["sample_index"] - delta_collision_samples, spike["sample_index"] + delta_collision_samples],
         )
+
         # exclude the spike itself (it is included in the collision_spikes by construction)
         pre_possible_consecutive_spike_indices = np.arange(consecutive_window_pre, spike_index_w_margin)
         post_possible_consecutive_spike_indices = np.arange(spike_index_w_margin + 1, consecutive_window_post)
diff --git a/src/spikeinterface/postprocessing/principal_component.py b/src/spikeinterface/postprocessing/principal_component.py
index 233625e09e..ce1c3bd5a0 100644
--- a/src/spikeinterface/postprocessing/principal_component.py
+++ b/src/spikeinterface/postprocessing/principal_component.py
@@ -600,8 +600,7 @@ def _all_pc_extractor_chunk(segment_index, start_frame, end_frame, worker_ctx):
 
     seg_size = recording.get_num_samples(segment_index=segment_index)
 
-    i0 = np.searchsorted(spike_times, start_frame)
-    i1 = np.searchsorted(spike_times, end_frame)
+    i0, i1 = np.searchsorted(spike_times, [start_frame, end_frame])
 
     if i0 != i1:
         # protect from spikes on border :  spike_time<0 or spike_time>seg_size
diff --git a/src/spikeinterface/postprocessing/spike_amplitudes.py b/src/spikeinterface/postprocessing/spike_amplitudes.py
index b6f25cda95..38cb714d59 100644
--- a/src/spikeinterface/postprocessing/spike_amplitudes.py
+++ b/src/spikeinterface/postprocessing/spike_amplitudes.py
@@ -218,9 +218,7 @@ def _spike_amplitudes_chunk(segment_index, start_frame, end_frame, worker_ctx):
     d = np.diff(spike_times)
     assert np.all(d >= 0)
 
-    i0 = np.searchsorted(spike_times, start_frame)
-    i1 = np.searchsorted(spike_times, end_frame)
-
+    i0, i1 = np.searchsorted(spike_times, [start_frame, end_frame])
     n_spikes = i1 - i0
     amplitudes = np.zeros(n_spikes, dtype=recording.get_dtype())
 
diff --git a/src/spikeinterface/preprocessing/detect_bad_channels.py b/src/spikeinterface/preprocessing/detect_bad_channels.py
index 0f4800c6e8..cc4e8601e2 100644
--- a/src/spikeinterface/preprocessing/detect_bad_channels.py
+++ b/src/spikeinterface/preprocessing/detect_bad_channels.py
@@ -18,7 +18,7 @@ def detect_bad_channels(
     nyquist_threshold=0.8,
     direction="y",
     chunk_duration_s=0.3,
-    num_random_chunks=10,
+    num_random_chunks=100,
     welch_window_ms=10.0,
     highpass_filter_cutoff=300,
     neighborhood_r2_threshold=0.9,
@@ -81,9 +81,10 @@ def detect_bad_channels(
     highpass_filter_cutoff : float
         If the recording is not filtered, the cutoff frequency of the highpass filter, by default 300
     chunk_duration_s : float
-        Duration of each chunk, by default 0.3
+        Duration of each chunk, by default 0.5
     num_random_chunks : int
-        Number of random chunks, by default 10
+        Number of random chunks, by default 100
+        Having many chunks is important for reproducibility.
     welch_window_ms : float
         Window size for the scipy.signal.welch that will be converted to nperseg, by default 10ms
     neighborhood_r2_threshold : float, default 0.95
@@ -174,20 +175,18 @@ def detect_bad_channels(
         channel_locations = recording.get_channel_locations()
         dim = ["x", "y", "z"].index(direction)
         assert dim < channel_locations.shape[1], f"Direction {direction} is wrong"
-        locs_depth = channel_locations[:, dim]
-        if np.array_equal(np.sort(locs_depth), locs_depth):
+        order_f, order_r = order_channels_by_depth(recording=recording, dimensions=("x", "y"))
+        if np.all(np.diff(order_f) == 1):
+            # already ordered
             order_f = None
             order_r = None
-        else:
-            # sort by x, y to avoid ambiguity
-            order_f, order_r = order_channels_by_depth(recording=recording, dimensions=("x", "y"))
 
         # Create empty channel labels and fill with bad-channel detection estimate for each chunk
         chunk_channel_labels = np.zeros((recording.get_num_channels(), len(random_data)), dtype=np.int8)
 
         for i, random_chunk in enumerate(random_data):
-            random_chunk_sorted = random_chunk[order_f] if order_f is not None else random_chunk
-            chunk_channel_labels[:, i] = detect_bad_channels_ibl(
+            random_chunk_sorted = random_chunk[:, order_f] if order_f is not None else random_chunk
+            chunk_labels = detect_bad_channels_ibl(
                 raw=random_chunk_sorted,
                 fs=recording.sampling_frequency,
                 psd_hf_threshold=psd_hf_threshold,
@@ -198,11 +197,10 @@ def detect_bad_channels(
                 nyquist_threshold=nyquist_threshold,
                 welch_window_ms=welch_window_ms,
             )
+            chunk_channel_labels[:, i] = chunk_labels[order_r] if order_r is not None else chunk_labels
 
         # Take the mode of the chunk estimates as final result. Convert to binary good / bad channel output.
         mode_channel_labels, _ = scipy.stats.mode(chunk_channel_labels, axis=1, keepdims=False)
-        if order_r is not None:
-            mode_channel_labels = mode_channel_labels[order_r]
 
         (bad_inds,) = np.where(mode_channel_labels != 0)
         bad_channel_ids = recording.channel_ids[bad_inds]
diff --git a/src/spikeinterface/qualitymetrics/misc_metrics.py b/src/spikeinterface/qualitymetrics/misc_metrics.py
index 4e871492f8..8dd5f857f6 100644
--- a/src/spikeinterface/qualitymetrics/misc_metrics.py
+++ b/src/spikeinterface/qualitymetrics/misc_metrics.py
@@ -848,16 +848,14 @@ def compute_drift_metrics(
         spike_vector = sorting.to_spike_vector()
 
         # retrieve spikes in segment
-        i0 = np.searchsorted(spike_vector["segment_index"], segment_index)
-        i1 = np.searchsorted(spike_vector["segment_index"], segment_index + 1)
+        i0, i1 = np.searchsorted(spike_vector["segment_index"], [segment_index, segment_index + 1])
         spikes_in_segment = spike_vector[i0:i1]
         spike_locations_in_segment = spike_locations[i0:i1]
 
         # compute median positions (if less than min_spikes_per_interval, median position is 0)
         median_positions = np.nan * np.zeros((len(unit_ids), num_bin_edges - 1))
         for bin_index, (start_frame, end_frame) in enumerate(zip(bins[:-1], bins[1:])):
-            i0 = np.searchsorted(spikes_in_segment["sample_index"], start_frame)
-            i1 = np.searchsorted(spikes_in_segment["sample_index"], end_frame)
+            i0, i1 = np.searchsorted(spikes_in_segment["sample_index"], [start_frame, end_frame])
             spikes_in_bin = spikes_in_segment[i0:i1]
             spike_locations_in_bin = spike_locations_in_segment[i0:i1][direction]
 
diff --git a/src/spikeinterface/widgets/_legacy_mpl_widgets/activity.py b/src/spikeinterface/widgets/_legacy_mpl_widgets/activity.py
index 939475c17d..9715b7ea87 100644
--- a/src/spikeinterface/widgets/_legacy_mpl_widgets/activity.py
+++ b/src/spikeinterface/widgets/_legacy_mpl_widgets/activity.py
@@ -95,8 +95,7 @@ def plot(self):
             num_frames = int(duration / self.bin_duration_s)
 
             def animate_func(i):
-                i0 = np.searchsorted(peaks["sample_index"], bin_size * i)
-                i1 = np.searchsorted(peaks["sample_index"], bin_size * (i + 1))
+                i0, i1 = np.searchsorted(peaks["sample_index"], [bin_size * i, bin_size * (i + 1)])
                 local_peaks = peaks[i0:i1]
                 artists = self._plot_one_bin(rec, probe, local_peaks, self.bin_duration_s)
                 return artists