From c2130dccb9644fa658f07838ad39e2835fd6e512 Mon Sep 17 00:00:00 2001
From: Jakob Ackermann <jakob.ackermann@overleaf.com>
Date: Wed, 18 Mar 2026 11:01:57 +0100
Subject: [PATCH] [clsi] use cheapest gzip compression level for history
 snapshot (#32251)

memoir manual with 1.5MiB snapshot:

level |load/decompress time | store/compress time |  size   | ratio | total sync time
 ---  | ---                 | ---                 |  ---    | ---   | ---
 6    | 18ms                | 57ms                |  412KiB | 26%   | 88ms
 1    | 17ms                | 28ms                |  509KiB | 32%   | 53ms
 0    |  8ms                | 10ms                | 1578KiB | 0%    | 33ms

total sync: read snapshot, walk dir, sync files to disk, save snapshot

GitOrigin-RevId: a2b1ee063af5aa749014f942db5e08bb1e685848
---
 services/clsi/app/js/HistoryResourceWriter.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/services/clsi/app/js/HistoryResourceWriter.js b/services/clsi/app/js/HistoryResourceWriter.js
index c2f766fdbc..3fb68dd5d1 100644
--- a/services/clsi/app/js/HistoryResourceWriter.js
+++ b/services/clsi/app/js/HistoryResourceWriter.js
@@ -200,7 +200,9 @@ async function saveSnapshot(
         globalBlobs,
         localBaseVersion,
         rawSnapshot: snapshot.toRaw(),
-      })
+      }),
+      // use cheapest gzip compression level
+      { level: 1 }
     ),
     { flag: 'wx' }
   )