diff --git a/discord_rss_bot/extensions/hoyolab.py b/discord_rss_bot/extensions/hoyolab.py
index 0f1abb3..f2044dc 100644
--- a/discord_rss_bot/extensions/hoyolab.py
+++ b/discord_rss_bot/extensions/hoyolab.py
@@ -16,6 +16,7 @@ import contextlib
 import json
 import logging
 import re
+import time
 from typing import TYPE_CHECKING
 from typing import ClassVar
 from typing import cast
@@ -102,6 +103,36 @@ def fetch_post(post_id: str) -> JsonObject | None:
 http_ok: int = 200
 
 
+# ---------------------------------------------------------------------------
+# In-memory cache for Hoyolab post data.
+# Key: post_id (str)
+# Value: tuple of (JsonObject | None, expiry_timestamp)
+#
+# Prevents redundant API calls when the same post is processed by both
+# ``process_entry()`` and ``modify_webhook()`` within a short timeframe.
+# ---------------------------------------------------------------------------
+_POST_CACHE: dict[str, tuple[JsonObject | None, float]] = {}
+
+#: Cache TTL in seconds.  Entries older than this are re-fetched.
+_CACHE_TTL_SECONDS: int = 300  # 5 minutes
+
+
+def _cached_fetch_post(post_id: str) -> JsonObject | None:
+    """Return cached post data if fresh, otherwise fetch and cache."""
+    now: float = time.time()
+    if post_id in _POST_CACHE:
+        cached_data, expiry = _POST_CACHE[post_id]
+        if now < expiry:
+            logger.debug("Cache hit for Hoyolab post %s", post_id)
+            return cached_data
+        logger.debug("Cache expired for Hoyolab post %s", post_id)
+
+    # Cache miss or expired — fetch fresh data.
+    post_data: JsonObject | None = fetch_post(post_id)
+    _POST_CACHE[post_id] = (post_data, now + _CACHE_TTL_SECONDS)
+    return post_data
+
+
 def _as_json_object(value: JsonValue) -> JsonObject:
     return cast("JsonObject", value) if isinstance(value, dict) else {}
 
@@ -148,7 +179,7 @@ class HoyolabExtension(FeedExtension):
         if not post_id:
             return {}
 
-        post_data: JsonObject | None = fetch_post(post_id)
+        post_data: JsonObject | None = _cached_fetch_post(post_id)
         if not post_data:
             return {}
 
@@ -202,7 +233,7 @@ class HoyolabExtension(FeedExtension):
         if not post_id:
             return webhook
 
-        post_data: JsonObject | None = fetch_post(post_id)
+        post_data: JsonObject | None = _cached_fetch_post(post_id)
         if not post_data:
             return webhook
 
diff --git a/discord_rss_bot/feeds.py b/discord_rss_bot/feeds.py
index e91d097..6de7b0a 100644
--- a/discord_rss_bot/feeds.py
+++ b/discord_rss_bot/feeds.py
@@ -56,9 +56,6 @@ from discord_rss_bot.custom_message import replace_tags_in_embed
 from discord_rss_bot.custom_message import replace_tags_in_text_message
 from discord_rss_bot.extensions import auto_enable_extensions_for_feed
 from discord_rss_bot.extensions import run_modify_webhook
-from discord_rss_bot.extensions.steam import extract_app_id as steam_extract_app_id
-from discord_rss_bot.extensions.steam import get_icon_file_for_app as steam_get_icon_file
-from discord_rss_bot.extensions.steam import is_steam_url
 from discord_rss_bot.filter.evaluator import get_entry_filter_decision_from_reader
 from discord_rss_bot.is_url_valid import is_url_valid
 from discord_rss_bot.settings import default_custom_embed
@@ -1765,7 +1762,7 @@ def create_components_v2_webhook(
     )
 
 
-def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches, too-many-statements]
+def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches]
     webhook_url: str,
     entry: Entry,
     reader: Reader,
@@ -1842,20 +1839,6 @@ def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches, t
     if custom_embed.thumbnail_url:
         discord_embed.set_thumbnail(url=custom_embed.thumbnail_url)
 
-    # Steam feed: override thumbnail with the game's capsule image when enabled.
-    steam_thumbnail_file: WebhookFile | None = None
-    if custom_embed.show_steam_game_icon_in_thumbnail and is_steam_url(feed.url or ""):
-        app_id: str | None = steam_extract_app_id(feed.url) or steam_extract_app_id(str(entry.link or ""))
-        if app_id:
-            icon_file: WebhookFile | None = steam_get_icon_file(app_id)
-            if icon_file:
-                steam_thumbnail_file = icon_file
-                discord_embed.set_thumbnail(url=f"attachment://{icon_file.filename}")
-            else:
-                discord_embed.set_thumbnail(
-                    url=f"https://cdn.cloudflare.steamstatic.com/steam/apps/{app_id}/capsule_sm_120.jpg",
-                )
-
     if custom_embed.image_url:
         discord_embed.set_image(url=custom_embed.image_url)
 
@@ -1868,9 +1851,6 @@ def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches, t
     if custom_embed.footer_icon_url and not custom_embed.footer_text:
         discord_embed.set_footer(text="-", icon_url=custom_embed.footer_icon_url)
 
-    if steam_thumbnail_file:
-        webhook.add_file(file=steam_thumbnail_file.content, filename=steam_thumbnail_file.filename)
-
     webhook.add_embed(discord_embed)
     return webhook