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I'm one of the admins on William's site. We're seeing this type of slowdown with as few as 10 users on the site at one time. I've had our host test the server during these times, and there's next to no server load and no disk I/O issues. We're using a dedicated cloud server with these specs:
CentOS 7 64-bit
Intel Xeon E5-1650 v3
Raid1 SSD
6 CPU Cores
30gb RAM
I know this is a different situation, but we've hosted several Wordpress sites (with all of their overhead) on a similar server without issue, so this one seemed like an ideal choice.
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Hello James, i have a simple i7 that gets old and 32 Gb of ram, no ssd, besides I am behind my personal connection and two sites turn on it. A bigger under dolphin, and the new under UNA. Currently 40 users online on the UNA site and many more on the Dolphin site simultaneously do not pose a problem, so when you say 10 users and 15 seconds to post, I thought server problem. It seems no, at least from a material point of view. Have you looked at MySQL? See maybe this tutorial, it concerns two php modules and the configuration of MySQL.
Currently I have this:key_buffer_size = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 16
max_connections = 200
table_open_cache = 100000
max_heap_table_size = 128M
tmp_table_size = 1024M
innodb_buffer_pool_size = 10GB
query_cache_type = 1
query_cache_limit = 2M
query_cache_size = 32Note that I am still under php 5.6...
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