If there is a need to always use pigz for gzip compression in your monorepo, instead of modifying every BUILD file to set compressor, you could use below tar_pigz.patch:

diff --git a/MODULE.bazel b/MODULE.bazel
index ae3346d..68ad16a 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -8,6 +8,7 @@ module(
 bazel_dep(name = "aspect_bazel_lib", version = "2.19.3")
 bazel_dep(name = "bazel_skylib", version = "1.4.1")
 bazel_dep(name = "gawk", version = "5.3.2.bcr.1")
+bazel_dep(name = "pigz", version = "2.8")
 bazel_dep(name = "platforms", version = "0.0.11")
 
 bazel_dep(name = "bazelrc-preset.bzl", version = "1.0.1", dev_dependency = True)
diff --git a/tar/private/tar.bzl b/tar/private/tar.bzl
index 79890f9..491ff02 100644
--- a/tar/private/tar.bzl
+++ b/tar/private/tar.bzl
@@ -94,6 +94,11 @@ _tar_attrs = {
     "compressor_args": attr.string(
         doc = "Arg list for `compressor`.",
     ),
+    "_pigz": attr.label(
+        default = "@pigz",
+        cfg = "exec",
+        executable = True,
+    ),
     "compute_unused_inputs": attr.int(
         doc = """
 Whether to discover and prune input files that will not contribute to the archive.
@@ -353,6 +358,7 @@ def _tar_impl(ctx):
     bsdtar = ctx.toolchains[TAR_TOOLCHAIN_TYPE]
     inputs = ctx.files.srcs[:]
     args = ctx.actions.args()
+    tools = []
 
     # Set mode
     args.add(ctx.attr.mode, format = "--%s")
@@ -363,6 +369,10 @@ def _tar_impl(ctx):
     # Compression args
     if ctx.executable.compressor:
         args.add("--use-compress-program", "%s %s" % (ctx.executable.compressor.path, ctx.attr.compressor_args))
+        tools.append(ctx.executable.compressor)
+    elif ctx.attr.compress == "gzip":
+        args.add("--use-compress-program", "%s -n" % (ctx.executable._pigz.path))
+        tools.append(ctx.executable._pigz)
     else:
         _add_compression_args(ctx.attr.compress, args)
 
@@ -411,7 +421,7 @@ def _tar_impl(ctx):
         mnemonic = "Tar",
         unused_inputs_list = unused_inputs_file,
         toolchain = TAR_TOOLCHAIN_TYPE,
-        tools = [ctx.executable.compressor] if ctx.executable.compressor else [],
+        tools = tools,
     )
 
     # TODO(3.0): Always return a list of providers.

In your MODULE.bazel, use

bazel_dep(name = "tar.bzl", version = "0.5.4")
single_version_override(
    module_name = "tar.bzl",
    patch_strip = 1,
    # patch to make gzip compression always use pigz for better performance
    patches = ["@@//:tar_pigz.patch"],
    version = "0.5.4",
)

Uh oh!

Use pigz for gzip compression #40

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