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用户登录 RoundCube 时出现巨大延迟。如果用户邮箱中有大约 2000 条消息，则延迟为 2-3 分钟。一般在“users”表中有435条记录，在“contacts”表中有1400条记录，在“contactgroupmembers”中有333条记录，在“contactgroups”中有56条记录。

切换 RoundCube sql 查询登录显示«UPDATE session SET»查询延迟：

[08-Feb-2012 16:05:10 +0000]: query(1): SELECT cache_id, data, cache_key FROM cache WHERE user_id = 84 AND cache_key = 'IMAP.messagecount' ORDER BY created DESC LIMIT 0, 1;

[08-Feb-2012 16:05:10 +0000]: query(1): UPDATE cache SET created = now(), data = 'a:5:{s:5:\"INBOX\";a:2:{s:3:\"ALL\";i:4041;s:6:\" UNSEEN\";i:1924;}s:6:\"Drafts\";a:1:{s:6:\"UNSEEN\ ";i:0;}s:4:\"Sent\";a:1:{s:6:\"UNSEEN\";i:0;}s:4:\ "Junk\";a:1:{s:6:\"UNSEEN\";i:0;}s:5:\"Trash\";a:1 :{s:6:\
"UNSEEN\";i:0;}}' WHERE user_id = 84 AND cache_key = 'IMAP.messagecount';

[08-Feb-2012 16:**05:10** +0000]: query(1): UPDATE session SET vars='bGFuZ3VhZ2V8czo1OiJydV9SVSI7aW1
<-- TRUNCATED -->
5MjQ7czo2OiJEcmFmdHMiO2k6MDtzOjQ6IlNlbnQiO2k6MDtzO jQ6Ikp1bmsiO2k6MDtzOjU6IlRyYXNoIjtpOjA7fQ==',chang ed='2012-02-08 16:05:10' WHERE sess_id='61eh0naumln6odsn9pvg8mdki4';

[08-Feb-2012 16:**06:29** +0000]: query(1): UPDATE cache SET created = now(), data = 'a:1:{s:5:\"INBOX\";a:2:{s:3:\"ALL\";i:4141;s:6:\" UNSEEN\";i:1924;}}' WHERE user_id = 84 AND cache_key = 'IMAP.messagecount';
[08-Feb-2012 16:06:29 +0000]: query(1): SELECT vars, ip, changed FROM session WHERE sess_id = '6
1eh0naumln6odsn9pvg8mdki4';

完全清洁表«联系人»后也没有延迟。

所有 RoundCube 设置都是默认设置。同一主机上的 IMAP 服务器。RoundCube 版本 0.7.1（最新）。MySQL — 5.1.61 PHP (php-fpm) — 5.3.8 Nginx -1.1.13

是否可以修复此 RoundCube 性能错误，联系人超过 1000 ？

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