Apache在TLS握手时响应非常慢

Question

在我的服务器上安装SSL后出现问题。通过追踪

curl -v -o delete.txt --trace-time https://asd.com
10:45:51.449913 * Rebuilt URL to: https://asd.com/
10:45:51.450034 * Hostname was NOT found in DNS cache
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                             Dload  Upload   Total   Spent    Left  Speed
0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     010:45:51.455058 *   Trying 0.0.0.0...
10:45:51.472201 * Connected to asd.com (0.0.0.0) port 443 (#0)
10:45:51.472763 * successfully set certificate verify locations:
10:45:51.472799 *   CAfile: none
CApath: /etc/ssl/certs
10:45:51.472993 * SSLv3, TLS handshake, Client hello (1):
10:45:51.473029 } [data not shown]
0     0    0     0    0     0      0      0 --:--:--  0:00:33 --:--:--    010:46:24.872573 * SSLv3, TLS handshake, Server hello (2):
10:46:24.872651 { [data not shown]
10:46:24.873717 * SSLv3, TLS handshake, CERT (11):

服务器有时会响应，有时则不响应。填写请求需要很长时间。请帮助我。