diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 06c02c6..d17c493 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -25,8 +25,8 @@ inp = pathlib.Path(config.get("post", "inp"))
 
 log.info(f"Reading swash output from '{sws_out}'")
 rsws = ReadSwash()
-rsws.read_time(sws_out.joinpath("tsec.dat"))
-rsws.read_x(sws_out.joinpath("xp.dat"))
+np.save(inp.joinpath("tsec"), rsws.read_time(sws_out.joinpath("tsec.dat")))
+np.save(inp.joinpath("xp"), rsws.read_x(sws_out.joinpath("xp.dat")))
 
 var = {
     "dep": rsws.read_scalar,
@@ -40,9 +40,10 @@ var = {
 
 inp.mkdir(exist_ok=True)
 with Pool() as pool:
+    log.info("Converting all data")
     pool.map(
-        lambda name, f: np.save(
-            inp.joinpath(name), f(sws_out.joinpath(name).with_suffix(".dat"))
+        lambda x: np.save(
+            inp.joinpath(x[0]), x[1](sws_out.joinpath(x[0]).with_suffix(".dat"))
         ),
         var.items(),
     )