diff --git a/abuild.in b/abuild.in
index 7cfa16a..db74f2d 100644
--- a/abuild.in
+++ b/abuild.in
@@ -426,6 +426,8 @@ default_unpack() {
 	verify || return 1
 	initdcheck || return 1
 	mkdir -p "$srcdir"
+	local gunzip=$(command -v pigz || echo gunzip)
+	[ $gunzip = "/usr/bin/pigz" ] && gunzip="$gunzip -d"
 	for u in $source; do
 		local s
 		if is_remote "$u"; then
@@ -439,7 +441,7 @@ default_unpack() {
 				tar -C "$srcdir" -xf "$s" || return 1;;
 			*.tar.gz|*.tgz)
 				msg "Unpacking $s..."
-				tar -C "$srcdir" -zxf "$s" || return 1;;
+				$gunzip -c "$s" | tar -C "$srcdir" -x || return 1;;
 			*.tar.bz2)
 				msg "Unpacking $s..."
 				tar -C "$srcdir" -jxf "$s" || return 1;;
@@ -448,11 +450,11 @@ default_unpack() {
 				tar -C "$srcdir" --lzip -xf "$s" || return 1;;
 			*.tar.lzma)
 				msg "Unpacking $s..."
-				unlzma -c "$s" | tar -C "$srcdir" -x  \
+				unlzma -T 0 -c "$s" | tar -C "$srcdir" -x  \
 					|| return 1;;
 			*.tar.xz)
 				msg "Unpacking $s..."
-				unxz -c "$s" | tar -C "$srcdir" -x || return 1;;
+				unxz -T 0 -c "$s" | tar -C "$srcdir" -x || return 1;;
 			*.zip)
 				msg "Unpacking $s..."
 				unzip -n -q "$s" -d "$srcdir" || return 1;;