sendou.ink/patches/remix-i18next@8.0.0.patch

diff --git a/build/index.js b/build/index.js
index a9437649528516ce80138ece72d3155f7e943f1c..4d5d9df4fb9728eb18575a114ad2d4ae8d76a875 100644
--- a/build/index.js
+++ b/build/index.js
@@ -5,14 +5,20 @@ export function createI18nextMiddleware({ detection, i18next = {}, plugins = [],
     let localeContext = createContext();
     let i18nextContext = createContext();
     let languageDetector = new LanguageDetector(detection);
+    // patched: one instance per language reused across requests, creating and initializing one costs ~40-100µs
+    let instancesByLng = new Map();
     return [
         async function i18nextMiddleware(args, next) {
             let lng = await languageDetector.detect(args);
             args.context.set(localeContext, lng);
-            let instance = createInstance(i18next);
-            for (const plugin of plugins ?? [])
-                instance.use(plugin);
-            await instance.init({ lng });
+            let instance = instancesByLng.get(lng);
+            if (!instance) {
+                instance = createInstance(i18next);
+                for (const plugin of plugins ?? [])
+                    instance.use(plugin);
+                await instance.init({ lng });
+                instancesByLng.set(lng, instance);
+            }
             args.context.set(i18nextContext, instance);
             return await next();
         },