Drupal の管理画面が遅い

Drupal でcronの設定をしたら
管理画面がめちゃくちゃ遅くなった．

Drupalの更新情報を読みにいっているらしくて，
プロキシ接続がタイムアウトになっていた．
以下の方法で対処．

I think the RSS feeds don't work if there is proxy server running. The request/connection is somehow being blocked.

The connection should be made first to the proxy and once it is established, then request can made.

I think the core function drupal_http_request() under /includes/common.inc doesn't support this.