diff --git a/modules/local/src/main/LocalRepo.scala b/modules/local/src/main/LocalRepo.scala
index 314622ea2ee9f..bd7bcc7305115 100644
--- a/modules/local/src/main/LocalRepo.scala
+++ b/modules/local/src/main/LocalRepo.scala
@@ -2,7 +2,7 @@ package lila.local
 
 import reactivemongo.api.Cursor
 import reactivemongo.api.bson.*
-import lila.common.Json.opaqueFormat
+import lila.common.Json.given
 import lila.db.JSON
 import play.api.libs.json.*
 
diff --git a/ui/.build/src/esbuild.ts b/ui/.build/src/esbuild.ts
index e02a03d5944fe..3fdc2dfb59478 100644
--- a/ui/.build/src/esbuild.ts
+++ b/ui/.build/src/esbuild.ts
@@ -54,6 +54,17 @@ export async function stopEsbuildWatch(): Promise<void> {
 }
 
 const plugins = [
+  // {
+  //   name: '_html', // experimental
+  //   setup(build: es.PluginBuild) {
+  //     build.onLoad({ filter: /\.ts$/ }, async (args: es.OnLoadArgs) => ({
+  //       loader: 'ts',
+  //       contents: (await fs.promises.readFile(args.path, 'utf8')).replace(/_html`([\s\S]*?)`/g, (_, s) =>
+  //         env.prod ? `\`${s.replace(/\s+/g, ' ').replaceAll('> <', '><').trim()}\`` : `\`${s}\``,
+  //       ),
+  //     }));
+  //   },
+  // },
   {
     name: 'onBundleDone',
     setup(build: es.PluginBuild) {
diff --git a/ui/.build/src/parse.ts b/ui/.build/src/parse.ts
index 60d47562d6c27..604d7fe8c19c3 100644
--- a/ui/.build/src/parse.ts
+++ b/ui/.build/src/parse.ts
@@ -50,16 +50,20 @@ export async function globArrays(globs: string[] | undefined, opts: fg.Options =
 }
 
 export async function folderSize(folder: string): Promise<number> {
-  let totalSize = 0;
+  async function getSize(dir: string): Promise<number> {
+    const entries = await fs.promises.readdir(dir, { withFileTypes: true });
 
-  async function getSize(dir: string) {
-    for (const file of await fs.promises.readdir(dir, { withFileTypes: true })) {
-      if (file.isDirectory()) await getSize(path.join(dir, file.name));
-      else if (file.isFile()) totalSize += (await fs.promises.stat(path.join(dir, file.name))).size;
-    }
+    const sizes = await Promise.all(
+      entries.map(async entry => {
+        const fullPath = path.join(dir, entry.name);
+        if (entry.isDirectory()) return getSize(fullPath);
+        if (entry.isFile()) return (await fs.promises.stat(fullPath)).size;
+        return 0;
+      }),
+    );
+    return sizes.reduce((acc: number, size: number) => acc + size, 0);
   }
-  await getSize(folder);
-  return totalSize;
+  return getSize(folder);
 }
 
 export async function readable(file: string): Promise<boolean> {
diff --git a/ui/.build/src/tsc.ts b/ui/.build/src/tsc.ts
index 8955489280fc8..39d98f7bdb8a9 100644
--- a/ui/.build/src/tsc.ts
+++ b/ui/.build/src/tsc.ts
@@ -112,7 +112,6 @@ async function splitConfig(cfgPath: string): Promise<SplitConfig[]> {
 
   co.lib = co.lib?.map((lib: string) => (lib.startsWith('lib.') ? lib.split('.')[1] : lib));
   co.incremental = true;
-
   config.compilerOptions = co;
   config.size = await folderSize(path.join(root, 'src'));
   config.include = config.include?.map((glob: string) =>
diff --git a/ui/@types/lichess/index.d.ts b/ui/@types/lichess/index.d.ts
index 7c577d8f3be89..c2e8f841a70e0 100644
--- a/ui/@types/lichess/index.d.ts
+++ b/ui/@types/lichess/index.d.ts
@@ -296,3 +296,4 @@ declare const site: Site;
 declare const fipr: Fipr;
 declare const i18n: I18n;
 declare module 'tablesort';
+declare const _html: (s: TemplateStringsArray, ...k: any) => string; // file://./../../.build/src/esbuild.ts
diff --git a/ui/bits/src/bits.polyglot.ts b/ui/bits/src/bits.polyglot.ts
index 6a007b0b83a92..e49cd1f950551 100644
--- a/ui/bits/src/bits.polyglot.ts
+++ b/ui/bits/src/bits.polyglot.ts
@@ -46,7 +46,6 @@ async function makeBookPgn(
     if (filter && !filter(game)) continue;
     traverseTree(co.pgn.startingPosition(game.headers).unwrap(), game.moves, maxPly);
   }
-  // calc weights and collapse secondary maps into arrays for less memory overhead
   const posMap = new Map<bigint, OpeningMove[]>();
   for (const [hash, map] of bigMap) {
     const moves = Array.from(map, ([uci, weight]) => ({ uci, weight }));
@@ -127,16 +126,16 @@ async function* pgnFromBlob(blob: Blob, chunkSize: number, progress?: PgnProgres
     const textChunk = await chunk.text();
     const crlfLast = textChunk.lastIndexOf('\r\n\r\n[');
     const lfLast = textChunk.lastIndexOf('\n\n[');
-    const gamesThisChunk =
+    const wholePgnsChunk =
       offset + chunk.size === totalSize || Math.max(crlfLast, lfLast) === -1
         ? textChunk
         : textChunk.slice(0, Math.max(lfLast + 2, crlfLast + 4));
-    const games = co.pgn.parsePgn(residual + gamesThisChunk).filter(game => {
+    const games = co.pgn.parsePgn(residual + wholePgnsChunk).filter(game => {
       const tag = game.headers.get('Variant');
       return !tag || tag.toLowerCase() === 'standard';
     });
     for (const game of games) yield game;
-    residual = textChunk.slice(gamesThisChunk.length);
+    residual = textChunk.slice(wholePgnsChunk.length);
     offset += chunkSize;
   }
 }