[feat] Improve performance by compressing in parallel (#6710)

* sanjaiyan: Improve performance by running functions in parallel

* Update index.js

* Update index.js

* format

* remove duplicate line

* conver to Promise.all

* Create twenty-apricots-grin.md

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

Author: sanjaiyan-dev

.changeset/twenty-apricots-grin.md

@@ -0,0 +1,6 @@
+---
+"@sveltejs/adapter-node": patch
+"@sveltejs/adapter-static": patch
+---
+
+Improve performance by compressing in parallel

packages/adapter-node/index.js

@@ -32,8 +32,10 @@ export default function (opts = {}) {
 
 			if (precompress) {
 				builder.log.minor('Compressing assets');
-				await builder.compress(`${out}/client`);
-				await builder.compress(`${out}/prerendered`);
+				await Promise.all([
+					builder.compress(`${out}/client`),
+					builder.compress(`${out}/prerendered`)
+				]);
 			}
 
 			builder.log.minor('Building server');

packages/adapter-static/index.js

@@ -64,15 +64,11 @@ export default function (options) {
 			builder.writePrerendered(pages, { fallback });
 
 			if (precompress) {
+				builder.log.minor('Compressing assets and pages');
 				if (pages === assets) {
-					builder.log.minor('Compressing assets and pages');
 					await builder.compress(assets);
 				} else {
-					builder.log.minor('Compressing assets');
-					await builder.compress(assets);
-
-					builder.log.minor('Compressing pages');
-					await builder.compress(pages);
+					await Promise.all([builder.compress(assets), builder.compress(pages)]);
 				}
 			}