more efficient setupt

Author: blink1073

.evergreen/scripts/setup_tests.py

@@ -362,11 +362,12 @@ def handle_test_env() -> None:
         write_env("DISABLE_CONTEXT")
 
     if test_name == "perf":
-        run_command("git clone --depth 1 https://github.com/mongodb/specifications.git")
         data_dir = ROOT / "specifications/source/benchmarking/data"
-        run_command("tar xf extended_bson.tgz", cwd=data_dir)
-        run_command("tar xf parallel.tgz", cwd=data_dir)
-        run_command("tar xf single_and_multi_document.tgz", cwd=data_dir)
+        if not data_dir.exists():
+            run_command("git clone --depth 1 https://github.com/mongodb/specifications.git")
+            run_command("tar xf extended_bson.tgz", cwd=data_dir)
+            run_command("tar xf parallel.tgz", cwd=data_dir)
+            run_command("tar xf single_and_multi_document.tgz", cwd=data_dir)
         write_env("TEST_PATH", str(data_dir))
         write_env("OUTPUT_FILE", str(ROOT / "results.json"))