我一直在对我的 TLS 性能进行基准测试，我注意到在“写入客户端密钥交换”阶段，与所有其他操作相比，开销很大。我想知道是否有什么我可以做的来加快这个速度？

40348.989720O ssl_info_callback SSL_connect SSLv3 read server certificate A
140348.989934O ssl_info_callback SSL_connect SSLv3 read server key exchange A
140348.989954O ssl_info_callback SSL_connect SSLv3 read server certificate request A
140348.989968O ssl_info_callback SSL_connect SSLv3 read server done A
140348.990606O ssl_info_callback SSL_connect SSLv3 write client certificate A
140349.29131O ssl_info_callback SSL_connect SSLv3 write client key exchange A
140349.35914O ssl_info_callback SSL_connect SSLv3 write certificate verify A
140349.36013O ssl_info_callback SSL_connect SSLv3 write change cipher spec A
140349.36062O ssl_info_callback SSL_connect SSLv3 write finished A
140349.36077O ssl_info_callback SSL_connect SSLv3 flush data
140349.36094O ssl_info_callback SSL_connect error in SSLv3 read server session ticket A

基于此，看起来客户端密钥交换大约需要 300 毫秒