diff --git a/MOi-Curvilinear/benchmark_index_search.py b/MOi-Curvilinear/benchmark_index_search.py
new file mode 100644
index 0000000..75214d6
--- /dev/null
+++ b/MOi-Curvilinear/benchmark_index_search.py
@@ -0,0 +1,120 @@
+from argparse import ArgumentParser
+from pathlib import Path
+import xarray as xr
+import tracemalloc
+import time
+
+from glob import glob
+
+import numpy as np
+
+import parcels
+
+parcelsv4 = True
+try:
+    from parcels.xgrid import _XGRID_AXES
+    from parcels.application_kernels.interpolation import ZeroInterpolator
+except ImportError:
+    parcelsv4 = False
+
+DATA_ROOT = "/Users/erik/Desktop/MOi"
+
+def run_benchmark(trace_memory: bool = False):
+
+    fileU = f"{DATA_ROOT}/GLO12/psy4v3r1-daily_U_2010-01-0[1-3].nc"
+    filenames = {"U": glob(fileU), "V": glob(fileU.replace("_U_", "_V_")), "W": glob(fileU.replace("_U_", "_W_"))}
+    mesh_mask = f"{DATA_ROOT}/domain_ORCA0083-N006/PSY4V3R1_mesh_hgr.nc"
+
+    if parcelsv4:
+
+        ds_u = xr.open_mfdataset(filenames["U"], concat_dim="time_counter", combine="nested", data_vars='minimal', coords='minimal', compat='override')[["vozocrtx"]].drop_vars(
+            ["nav_lon", "nav_lat"]
+        )
+        ds_v = xr.open_mfdataset(filenames["V"], concat_dim="time_counter", combine="nested", data_vars='minimal', coords='minimal', compat='override')[["vomecrty"]].drop_vars(
+            ["nav_lon", "nav_lat"]
+        )
+        ds_depth = xr.open_mfdataset(filenames["W"], concat_dim="time_counter", combine="nested", data_vars='minimal', coords='minimal', compat='override')[["depthw"]]
+        ds_mesh = xr.open_dataset(mesh_mask)[["glamf", "gphif"]].isel(t=0)
+
+        ds = xr.merge([ds_u, ds_v, ds_depth, ds_mesh], compat="identical").rename({"vozocrtx": "U", "vomecrty": "V"}).rename({"glamf": "lon", "gphif": "lat", "time_counter": "time", "depthw": "depth"})
+
+        xgcm_grid = parcels.xgcm.Grid(
+            ds,
+            coords={
+                "X": {"left": "x"},
+                "Y": {"left": "y"},
+                "Z": {"center": "deptht", "left": "depth"},
+                "T": {"center": "time"},
+            },
+            periodic=False,
+        )
+        grid = parcels.xgrid.XGrid(xgcm_grid)
+
+        U = parcels.Field("U", ds["U"], grid, interp_method=ZeroInterpolator)
+        V = parcels.Field("V", ds["V"], grid, interp_method=ZeroInterpolator)
+        U.units = parcels.GeographicPolar()
+        V.units = parcels.Geographic()
+        UV = parcels.VectorField("UV", U, V)
+
+        fieldset = parcels.FieldSet([U, V, UV])
+    else:
+        filenames = {
+            "U": {"lon": mesh_mask, "lat": mesh_mask, "depth": filenames["W"][0], "data": filenames["U"]},
+            "V": {"lon": mesh_mask, "lat": mesh_mask, "depth": filenames["W"][0], "data": filenames["V"]},
+        }
+        fieldset = parcels.FieldSet.from_netcdf(
+            filenames,
+            variables={"U": "vozocrtx", "V": "vomecrty"},
+            dimensions={"time": "time_counter", "lat": "gphif", "lon": "glamf", "depth": "depthw"},
+        )
+
+    for npart in [1, 10, 100, 1_000, 5_000, 10_000, 50_000, 100_000, 500_000, 1_000_000, 5_000_000]:
+        X, Y = np.meshgrid(
+            np.linspace(75, 179, int(np.sqrt(npart))),
+            np.linspace(-70, 70, int(np.sqrt(npart)))
+        )
+        lon = X.flatten()
+        lat = Y.flatten()
+        depth = np.zeros_like(lon)
+        ptime = fieldset.time_interval.left
+
+        pset = parcels.ParticleSet(fieldset=fieldset, lon=lon, lat=lat, depth=depth, time=ptime)
+
+        print(f"Running {len(lon):_} particles with parcels v{4 if parcelsv4 else 3}")
+
+        for i in range(2):
+            if trace_memory:
+                tracemalloc.start()
+            else:
+                start = time.time()
+
+            # Trigger search
+            fieldset.UV.eval(pset.time, pset.depth, pset.lat, pset.lon, pset)
+
+            if trace_memory:
+                current, peak = tracemalloc.get_traced_memory()
+                tracemalloc.stop()
+                print(f"Memory usage {i+1}: current={current / 1e6:.0f} MB, peak={peak / 1e6:.0f} MB")
+            else:
+                elapsed_time = time.time() - start
+                print(f"Execution time {i+1}: {elapsed_time:.0f} seconds")
+
+        print("")
+
+
+def main(args=None):
+    p = ArgumentParser()
+
+    p.add_argument(
+        "-m",
+        "--memory",
+        action="store_true",
+        help="Enable memory tracing (default: False)",
+    )
+
+    args = p.parse_args(args)
+    run_benchmark(args.memory)
+
+
+if __name__ == "__main__":
+    main()