diff --git a/.github/container/nsys_jax/nsys_jax/data_loaders.py b/.github/container/nsys_jax/nsys_jax/data_loaders.py
index dabafd497..195989b13 100644
--- a/.github/container/nsys_jax/nsys_jax/data_loaders.py
+++ b/.github/container/nsys_jax/nsys_jax/data_loaders.py
@@ -592,15 +592,20 @@ def _drop_non_tsl(compile_df: pd.DataFrame) -> pd.DataFrame:
 
 
 def _read_nvtx_pushpop_trace_file(file: pathlib.Path) -> pd.DataFrame:
-    def keep_column(name):
-        return name not in {"PID", "Lvl", "NameTree"}
-
-    return pd.read_csv(
-        lzma.open(file, "rt", newline=""),
-        dtype={"RangeId": np.int32},
-        index_col="RangeId",
-        usecols=keep_column,
-    )
+    if file.suffix == ".parquet":
+        # New mode; the .csv to .parquet conversion is done in nsys-jax
+        return pd.read_parquet(file)
+    else:
+
+        def keep_column(name):
+            return name not in {"PID", "Lvl", "NameTree"}
+
+        return pd.read_csv(
+            lzma.open(file, "rt", newline=""),
+            dtype={"RangeId": np.int32},
+            index_col="RangeId",
+            usecols=keep_column,
+        )
 
 
 def _load_nvtx_pushpop_trace_single(name: pathlib.Path) -> pd.DataFrame:
@@ -639,7 +644,9 @@ def remove_program_id_and_name(row):
 
 
 def _load_nvtx_pushpop_trace(prefix: pathlib.Path, frames: set[str]) -> pd.DataFrame:
-    path = prefix / "report_nvtx_pushpop_trace.csv.xz"
+    new_path = prefix / "report_nvtx_pushpop_trace.parquet"
+    legacy_path = prefix / "report_nvtx_pushpop_trace.csv.xz"
+    path = new_path if new_path.exists() else legacy_path
     if path.is_dir():
         # We're looking at the output of nsys-jax-combine
         filenames = sorted(path.iterdir())
diff --git a/.github/container/nsys_jax/nsys_jax/scripts/nsys_jax.py b/.github/container/nsys_jax/nsys_jax/scripts/nsys_jax.py
index 522e636f1..c0c3dfc95 100644
--- a/.github/container/nsys_jax/nsys_jax/scripts/nsys_jax.py
+++ b/.github/container/nsys_jax/nsys_jax/scripts/nsys_jax.py
@@ -3,6 +3,7 @@
 from contextlib import contextmanager
 from glob import glob, iglob
 import lzma
+import numpy as np
 import os
 import os.path as osp
 import pandas as pd  # type: ignore
@@ -369,7 +370,9 @@ def run_nsys_recipe(recipe, report_file, tmp_dir, output_queue):
             if osp.isdir(full_path) or not osp.exists(full_path):
                 continue
             output_queue.put((ofile, full_path, COMPRESS_NONE))
-        print(f"{archive_name}: post-processing finished in {time.time()-start:.2f}s")
+        print(
+            f"{archive_name}: recipe post-processing finished in {time.time()-start:.2f}s"
+        )
 
     def compress_and_archive(prefix, file, output_queue):
         """
@@ -401,9 +404,25 @@ def run_nsys_stats_report(report, report_file, tmp_dir, output_queue):
             ],
             check=True,
         )
-        for ofile in iglob("report_" + report + ".csv", root_dir=tmp_dir):
-            compress_and_archive(tmp_dir, ofile, output_queue)
-        print(f"{archive_name}: post-processing finished in {time.time()-start:.2f}s")
+        output_path = osp.join(tmp_dir, f"report_{report}.csv")
+
+        # TODO: avoid the .csv indirection
+        def keep_column(name):
+            return name not in {"PID", "Lvl", "NameTree"}
+
+        df = pd.read_csv(
+            output_path,
+            dtype={"RangeId": np.int32},
+            index_col="RangeId",
+            usecols=keep_column,
+        )
+        parquet_name = f"report_{report}.parquet"
+        parquet_path = osp.join(tmp_dir, parquet_name)
+        df.to_parquet(parquet_path)
+        output_queue.put((parquet_name, parquet_path, COMPRESS_NONE))
+        print(
+            f"{archive_name}: stats post-processing finished in {time.time()-start:.2f}s"
+        )
 
     def save_device_stream_thread_names(tmp_dir, report, output_queue):
         """