Problems about the efficiency of smarty template

Smarty Template Efficiency Issues!
Recently using Smarty template, found that will be used to file_exists, this will not increase the burden of Io, this is not inevitable?

------Solution--------------------
No impact, the server is more robust than you think.
Since he needs to translate your template file into a PHP program, use the Include in
So of course to check whether the file exists, not only this, he will also check whether your template file has been changed, if changed, he will be re-translated into PHP program
If you enable caching, he also checks to see if the cache file exists and is too old. To jiuding whether to use the cache file directly or to regenerate the cache file
------Solution--------------------
Network-related IO, such as Echo without buffering

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