As you know, each time php script is executed, PHP interpreter need to compile it first to bytecode and only after that – execute. That compilation takes much time.
APC PHP extension (which will be included and enabled in PHP6 by default. It becomes a standard) can speedup php script execution process by caching once compiled PHP bytecode in memory. So, installing this extension increases your server performance (we assume you are doing this at CPanel/WHM controlled server). To install extension just do the following:
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