diff --git a/scripts/core/config.sh b/scripts/core/config.sh
index 1f7d0cc..5509a32 100644
--- a/scripts/core/config.sh
+++ b/scripts/core/config.sh
@@ -2885,143 +2885,19 @@ stop_subconverter() {
   rm -f "$pid_file"
 }
 
-subscription_payload_max_bytes() {
-  echo "${CLASH_SUBSCRIPTION_MAX_BYTES:-10485760}"
-}
-
-subscription_yaml_parse_timeout() {
-  echo "${CLASH_YAML_PARSE_TIMEOUT:-10}"
-}
-
-file_size_bytes() {
-  local file="$1"
-  local size
-
-  size="$(wc -c < "$file" 2>/dev/null)" || return 1
-  set -- $size
-  echo "${1:-0}"
-}
-
-run_command_with_timeout() {
-  local seconds="$1"
-  local pid watcher rc
-
-  shift
-
-  if command -v timeout >/dev/null 2>&1; then
-    timeout "$seconds" "$@"
-    return $?
-  fi
-
-  "$@" &
-  pid=$!
-
-  (
-    sleep "$seconds"
-    kill "$pid" 2>/dev/null || true
-  ) &
-  watcher=$!
-
-  wait "$pid"
-  rc=$?
-
-  kill "$watcher" 2>/dev/null || true
-  wait "$watcher" 2>/dev/null || true
-
-  return "$rc"
-}
-
-subscription_payload_precheck() {
-  local file="$1"
-  local size max preview_file first_nonempty
-
-  SUBSCRIPTION_PAYLOAD_REJECT_REASON=""
-  SUBSCRIPTION_PAYLOAD_SIZE_BYTES=""
-
-  [ -s "$file" ] || {
-    SUBSCRIPTION_PAYLOAD_REJECT_REASON="返回内容为空"
-    return 1
-  }
-
-  size="$(file_size_bytes "$file" 2>/dev/null || echo 0)"
-  max="$(subscription_payload_max_bytes)"
-  case "$size" in
-    ''|*[!0-9]*) size="0" ;;
-  esac
-  case "$max" in
-    ''|*[!0-9]*) max="10485760" ;;
-  esac
-  SUBSCRIPTION_PAYLOAD_SIZE_BYTES="$size"
-
-  if [ "$size" -gt "$max" ]; then
-    SUBSCRIPTION_PAYLOAD_REJECT_REASON="返回内容过大：${size} bytes，超过上限 ${max} bytes"
-    return 1
-  fi
-
-  preview_file="$(config_tmp_dir)/subscription-response-head.txt"
-  mkdir -p "$(config_tmp_dir)"
-  sed -n '1,20p' "$file" > "$preview_file" 2>/dev/null || true
-
-  if grep -Eiq '<!doctype[[:space:]]+html|<html([[:space:]>]|$)|<head([[:space:]>]|$)|<body([[:space:]>]|$)|</html>' "$preview_file" 2>/dev/null; then
-    SUBSCRIPTION_PAYLOAD_REJECT_REASON="返回内容看起来是 HTML，不是 Clash YAML"
-    return 1
-  fi
-
-  first_nonempty="$(sed -n '/^[[:space:]]*$/d; s/^[[:space:]]*//; p; q' "$preview_file" 2>/dev/null || true)"
-  case "$first_nonempty" in
-    \<*)
-      SUBSCRIPTION_PAYLOAD_REJECT_REASON="返回内容以 '<' 开头，看起来不是 Clash YAML"
-      return 1
-      ;;
-  esac
-
-  return 0
-}
-
 subscription_yaml_validate() {
   local file="$1"
-  local parse_rc structure_rc structure_ok
-  local timeout_seconds errexit_was_set
 
-  SUBSCRIPTION_YAML_VALIDATE_ERROR=""
-
-  if ! subscription_payload_precheck "$file"; then
-    SUBSCRIPTION_YAML_VALIDATE_ERROR="$SUBSCRIPTION_PAYLOAD_REJECT_REASON"
-    return 1
-  fi
-
-  timeout_seconds="$(subscription_yaml_parse_timeout)"
+  [ -s "$file" ] || return 1
 
   # 先做一次最小 YAML 解析校验
-  errexit_was_set="false"
-  case "$-" in
-    *e*)
-      errexit_was_set="true"
-      set +e
-      ;;
-  esac
-  run_command_with_timeout "$timeout_seconds" "$(yq_bin)" eval '.' "$file" >/dev/null 2>&1
-  parse_rc=$?
-  [ "$errexit_was_set" = "true" ] && set -e
-  if [ "$parse_rc" -ne 0 ]; then
-    if [ "$parse_rc" -eq 124 ] || [ "$parse_rc" -eq 137 ] || [ "$parse_rc" -eq 143 ]; then
-      SUBSCRIPTION_YAML_VALIDATE_ERROR="YAML 解析超时（>${timeout_seconds}s）"
-    else
-      SUBSCRIPTION_YAML_VALIDATE_ERROR="YAML 解析失败"
-    fi
+  if ! "$(yq_bin)" eval '.' "$file" >/dev/null 2>&1; then
     return 1
   fi
 
   # 再做一次 Clash/Mihomo 订阅的基本结构校验
   # 允许是完整配置，也允许是仅包含 proxies / proxy-groups / rules / rule-providers 的订阅
-  errexit_was_set="false"
-  case "$-" in
-    *e*)
-      errexit_was_set="true"
-      set +e
-      ;;
-  esac
-  structure_ok="$(run_command_with_timeout "$timeout_seconds" "$(yq_bin)" eval '
+  if ! "$(yq_bin)" eval '
     (
       (.proxies != null) or
       (.["proxy-groups"] != null) or
@@ -3031,20 +2907,7 @@ subscription_yaml_validate() {
       (.port != null) or
       (.mode != null)
     )
-  ' "$file" 2>/dev/null)"
-  structure_rc=$?
-  [ "$errexit_was_set" = "true" ] && set -e
-  if [ "$structure_rc" -ne 0 ]; then
-    if [ "$structure_rc" -eq 124 ] || [ "$structure_rc" -eq 137 ] || [ "$structure_rc" -eq 143 ]; then
-      SUBSCRIPTION_YAML_VALIDATE_ERROR="YAML 结构校验超时（>${timeout_seconds}s）"
-    else
-      SUBSCRIPTION_YAML_VALIDATE_ERROR="YAML 结构校验失败"
-    fi
-    return 1
-  fi
-
-  if [ "$structure_ok" != "true" ]; then
-    SUBSCRIPTION_YAML_VALIDATE_ERROR="返回内容不是可运行的 Clash YAML"
+  ' "$file" 2>/dev/null | grep -qx 'true'; then
     return 1
   fi
 
@@ -3275,12 +3138,8 @@ convert_subscription_via_subconverter() {
 
   [ "$errexit_was_set" = "true" ] && set -e
 
-  http_code="${curl_meta%%$'\n'*}"
-  if [ "$http_code" = "$curl_meta" ]; then
-    effective_url=""
-  else
-    effective_url="${curl_meta#*$'\n'}"
-  fi
+  http_code="$(printf '%s\n' "$curl_meta" | head -n 1)"
+  effective_url="$(printf '%s\n' "$curl_meta" | sed -n '2p')"
 
   if [ -n "${effective_url:-}" ]; then
     if [ "$scheme" = "file" ]; then
@@ -3312,20 +3171,6 @@ convert_subscription_via_subconverter() {
     return 1
   }
 
-  if ! subscription_payload_precheck "$tmp_file"; then
-    write_subscription_invalid_debug_snapshot "$tmp_file"
-
-    warn "subconverter 返回内容预检查失败：$SUBSCRIPTION_PAYLOAD_REJECT_REASON"
-    warn "调试预览已写入：$(config_tmp_dir)/subscription-invalid-preview.txt"
-    [ -f "$log_file" ] && warn "subconverter 日志：$log_file"
-
-    rm -f "$tmp_file" 2>/dev/null || true
-    return 1
-  fi
-
-  info "subconverter 响应大小：${SUBSCRIPTION_PAYLOAD_SIZE_BYTES:-unknown} bytes"
-  info "正在校验 subconverter 返回的 YAML"
-
   if subscription_yaml_validate "$tmp_file"; then
     validate_ok="true"
   fi
@@ -3333,7 +3178,7 @@ convert_subscription_via_subconverter() {
   if [ "$validate_ok" != "true" ]; then
     write_subscription_invalid_debug_snapshot "$tmp_file"
 
-    warn "subconverter 返回内容不是合法 Clash YAML：${SUBSCRIPTION_YAML_VALIDATE_ERROR:-未知原因}"
+    warn "subconverter 返回内容不是合法 Clash YAML"
     warn "调试预览已写入：$(config_tmp_dir)/subscription-invalid-preview.txt"
     [ -f "$log_file" ] && warn "subconverter 日志：$log_file"