признаки слабого сервера или надо настроить?

[Alex Podusov]

Апач желательное но необязательное условие. Критично - PHP 5.2 и модули.
Минимальные требования:

The following configuration is the minimum required:
- a web server capable of running PHP
- PHP 5.2.0 or newer with the following extensions:
- filter
- GD2
- JSON
- mysql
- pcre
- session
- SPL
- standard
- xml
Some extensions can be optionally compiled into PHP. A list of loaded
extensions can be checked using the phpinfo() function.
- memory_limit set to at least to 64M in php.ini
- MySQL 4.1 or newer
- 200 MB of disk space
- AllowOverride in the Apache configuration includes "Indexes" and "FileInfo"
(see FAQ below)