how much performance drop after switched mtime-checking to fileinfo?

[email protected] (Xuefer Tinys)
Newsgroups php.smarty.dev
Message-ID <[email protected]>
iirc, due to apc issue, Smarty changed mtime-checking into "get info
from compiled tpl"
i wonder how much performance drop under high load.
does a fileread takes more memory/resource than a filemtime() ?
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